Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie

Countdown continued

1…110111113115116…162

Comments

  • #3362
    wally79
    Registered Users, Registered Users 2 Posts: 2,947 ✭✭✭wally79


    GTTDI GOD wrote: »
    7 * (4 + 3) * (8 + 6 - 5) = 441

    4, 6, 7, 8, 9, 10
    375

    (10*6)+8+7=75*(9-4)=375

    2 2 4 5 6 10

    337


  • #3363
    GTTDI GOD
    Registered Users, Registered Users 2 Posts: 1,135 ✭✭✭GTTDI GOD


    wally79 wrote: »
    2 2 4 5 6 10

    337

    5 * 6 + 4 = 34 * 10 - 2 = 338

    1, 3, 5, 5, 8, 10
    527


  • #3364
    Wanderer2010
    Registered Users, Registered Users 2 Posts: 6,743 ✭✭✭Wanderer2010


    GTTDI GOD wrote: »
    5 * 6 + 4 = 34 * 10 - 2 = 338

    1, 3, 5, 5, 8, 10
    527

    8*(5+1)=48+5=53*10=530-3=527

    100 4 5 5 9 1
    633


  • #3365
    wally79
    Registered Users, Registered Users 2 Posts: 2,947 ✭✭✭wally79


    Wanderer2010 wrote: »
    8*(5+1)=48+5=53*10=530-3=527

    100 4 5 5 9 1
    633

    (100+4)*(5+1)=624+9=633

    1 2 4 5 7 8

    369


  • #3366
    Notoldorwise
    Registered Users, Registered Users 2 Posts: 246 ✭✭Notoldorwise


    wally79 wrote: »
    (100+4)*(5+1)=624+9=633

    1 2 4 5 7 8

    369

    (5*8)+1=41*(7+2)=369


    2 3 5 7 8 25

    831


  • Advertisement
  • #3367
    Wanderer2010
    Registered Users, Registered Users 2 Posts: 6,743 ✭✭✭Wanderer2010


    Notoldorwise wrote: »
    (5*8)+1=41*(7+2)=369


    2 3 5 7 8 25

    831

    (8*5)-7=33*25=825+(3*2)=831

    7 5 9 10 1 4
    729


  • #3368
    brophya2007
    Registered Users, Registered Users 2 Posts: 298 ✭✭brophya2007


    Wanderer2010 wrote: »

    7 5 9 10 1 4
    729

    (7+1)*9*10=720
    720+4+5 = 729

    9 1 3 4 5 25

    622


  • #3369
    wally79
    Registered Users, Registered Users 2 Posts: 2,947 ✭✭✭wally79


    brophya2007 wrote: »
    (7+1)*9*10=720
    720+4+5 = 729

    9 1 3 4 5 25

    622

    (4+1)*5*25=625-3=622

    3 3 5 6 7 10

    653


  • #3370
    Wanderer2010
    Registered Users, Registered Users 2 Posts: 6,743 ✭✭✭Wanderer2010


    wally79 wrote: »
    (4+1)*5*25=625-3=622

    3 3 5 6 7 10

    653

    (6+5)*(3+3) = 66*10 =660-7 = 653

    75 10 1 2 4 6
    557


  • #3371
    wally79
    Registered Users, Registered Users 2 Posts: 2,947 ✭✭✭wally79


    Wanderer2010 wrote: »
    (6+5)*(3+3) = 66*10 =660-7 = 653

    75 10 1 2 4 6
    557

    75+10+(4*2)=93*6=558-1=557

    4 4 6 7 8 50

    367


  • Advertisement
  • #3372
    Wanderer2010
    Registered Users, Registered Users 2 Posts: 6,743 ✭✭✭Wanderer2010


    wally79 wrote: »
    75+10+(4*2)=93*6=558-1=557

    4 4 6 7 8 50

    367

    6-(4/4)=5
    (50-5)*8=360+7=367

    25 9 2 4 6 7
    813


  • #3373
    wally79
    Registered Users, Registered Users 2 Posts: 2,947 ✭✭✭wally79


    Wanderer2010 wrote: »
    6-(4/4)=5
    (50-5)*8=360+7=367

    25 9 2 4 6 7
    813

    25*4=100-7-2=91*9=819-6=813

    3 4 5 7 9 25

    664


  • #3374
    Wanderer2010
    Registered Users, Registered Users 2 Posts: 6,743 ✭✭✭Wanderer2010


    wally79 wrote: »
    25*4=100-7-2=91*9=819-6=813

    3 4 5 7 9 25

    664

    25*3*9=675-7-4=664

    8 5 1 9 2 7
    543


  • #3375
    wally79
    Registered Users, Registered Users 2 Posts: 2,947 ✭✭✭wally79


    Wanderer2010 wrote: »
    25*3*9=675-7-4=664

    8 5 1 9 2 7
    543

    (7*9)+5=68*8=544-1=543

    2 3 6 7 8 25

    444


  • #3376
    Clauric
    Registered Users, Registered Users 2 Posts: 610 ✭✭✭Clauric


    wally79 wrote: »
    (7*9)+5=68*8=544-1=543

    2 3 6 7 8 25

    444

    7 + 8 + 3 = 18
    18 * 25 = 450
    450 - 6 = 444

    QED

    Numbers:
    1, 3, 5, 5, 7, 9

    Target:
    852


  • #3377
    Wanderer2010
    Registered Users, Registered Users 2 Posts: 6,743 ✭✭✭Wanderer2010


    Clauric wrote: »
    7 + 8 + 3 = 18
    18 * 25 = 450
    450 - 6 = 444

    QED

    Numbers:
    1, 3, 5, 5, 7, 9

    Target:
    852

    9+3=12
    7*(5+5)=70+1=71
    12*71=852

    6 8 1 3 9 8
    793


  • #3378
    Niska
    Registered Users, Registered Users 2 Posts: 2,487 ✭✭✭Niska


    Wanderer2010 wrote: »

    6 8 1 3 9 8
    793

    (8 + 3 ( * 8 = 88 *9 = 792 +1 = 793

    =======================

    2, 4, 5, 8, 9, 50

    Target: 652


  • #3379
    Wanderer2010
    Registered Users, Registered Users 2 Posts: 6,743 ✭✭✭Wanderer2010


    Niska wrote: »
    (8 + 3 ( * 8 = 88 *9 = 792 +1 = 793

    =======================

    2, 4, 5, 8, 9, 50

    Target: 652

    (9+4)*50=650+2=652

    50 7 4 9 1 3
    622


  • #3380
    Niska
    Registered Users, Registered Users 2 Posts: 2,487 ✭✭✭Niska


    Wanderer2010 wrote: »
    50 7 4 9 1 3
    622

    50 + 7 + (4 * 3) [12] = 69 *9 = 621 + 1 = 622

    ===============
    Aside, quick-tip: If there is a 9 in the problem:

    A number is divisible by 9 if the sum of it's digits is divisible by 9. If the sum is not divisible by 9, you can still use the sum to see how far away the target is from 9.

    Eg: 622 -> 6 +2 +2 = 10 - not divisible by 9, but just 1 away. So we know 622 -1 is divisible by 9. So 622 -1 = 621. 6 + 2 +1 = 9. (621 / 9 = 69)

    Ex2 - 754 -> 7 +5 +4 = 16 (Not divisible, but 2 away from 18 which is) so 754 + 2 = 756 (7 + 5+ 6 = 18, divisible by 9. 756 / 9 = 84)
    ===============

    2,5, 9, 25, 50, 100

    target: 725


  • #3381
    Wanderer2010
    Registered Users, Registered Users 2 Posts: 6,743 ✭✭✭Wanderer2010


    Niska wrote: »
    50 + 7 + (4 * 3) [12] = 69 *9 = 621 + 1 = 622

    ===============
    Aside, quick-tip: If there is a 9 in the problem:

    A number is divisible by 9 if the sum of it's digits is divisible by 9. If the sum is not divisible by 9, you can still use the sum to see how far away the target is from 9.

    Eg: 622 -> 6 +2 +2 = 10 - not divisible by 9, but just 1 away. So we know 622 -1 is divisible by 9. So 622 -1 = 621. 6 + 2 +1 = 9. (621 / 9 = 69)

    Ex2 - 754 -> 7 +5 +4 = 16 (Not divisible, but 2 away from 18 which is) so 754 + 2 = 756 (7 + 5+ 6 = 18, divisible by 9. 756 / 9 = 84)
    ===============

    2,5, 9, 25, 50, 100

    target: 725

    Thanks for the tip, you are after speeding up this thread!

    (50÷2)+(9-5)=29*25=725

    8 6 2 2 10 7
    503


  • Advertisement
  • #3382
    Niska
    Registered Users, Registered Users 2 Posts: 2,487 ✭✭✭Niska


    Wanderer2010 wrote: »

    8 6 2 2 10 7
    503

    No 9!

    (6 * 10) = 2 = 62 *8 = 496 +7 = 503

    =====================

    2,6,6, 8, 10, 50

    target: 922


  • #3383
    wally79
    Registered Users, Registered Users 2 Posts: 2,947 ✭✭✭wally79


    Niska wrote: »
    No 9!

    (6 * 10) = 2 = 62 *8 = 496 +7 = 503

    =====================

    2,6,6, 8, 10, 50

    target: 922

    50+(6*8)-6=92*10=920+2=922

    3 3 5 6 9 25

    711


  • #3384
    Wanderer2010
    Registered Users, Registered Users 2 Posts: 6,743 ✭✭✭Wanderer2010


    wally79 wrote: »
    50+(6*8)-6=92*10=920+2=922

    3 3 5 6 9 25

    711

    25*3=75
    6-(5-3)=4
    (75+4)*9=711

    8 7 2 4 6 7
    754


  • #3385
    GTTDI GOD
    Registered Users, Registered Users 2 Posts: 1,135 ✭✭✭GTTDI GOD


    Niska wrote: »
    ===============
    Aside, quick-tip: If there is a 9 in the problem:

    A number is divisible by 9 if the sum of it's digits is divisible by 9. If the sum is not divisible by 9, you can still use the sum to see how far away the target is from 9.

    Eg: 622 -> 6 +2 +2 = 10 - not divisible by 9, but just 1 away. So we know 622 -1 is divisible by 9. So 622 -1 = 621. 6 + 2 +1 = 9. (621 / 9 = 69)

    Ex2 - 754 -> 7 +5 +4 = 16 (Not divisible, but 2 away from 18 which is) so 754 + 2 = 756 (7 + 5+ 6 = 18, divisible by 9. 756 / 9 = 84)
    ===============

    It also works for 3 and 6, if the sum is even then it is divisible by 6, the more you know!


  • #3386
    Niska
    Registered Users, Registered Users 2 Posts: 2,487 ✭✭✭Niska


    Wanderer2010 wrote: »

    8 7 2 4 6 7
    754

    (8 +6) * 4 = 56 +2 = 58 * (6 + 7)[13] = 754

    ============================

    3, 5, 5, 7, 8, 10

    Target: 478


  • #3387
    Wanderer2010
    Registered Users, Registered Users 2 Posts: 6,743 ✭✭✭Wanderer2010


    Niska wrote: »
    (8 +6) * 4 = 56 +2 = 58 * (6 + 7)[13] = 754

    ============================

    3, 5, 5, 7, 8, 10

    Target: 478

    Hard luck on my puzzle. Im afraid I only had a single 6 in it. Here is another way around it:

    7*8=56+2 = 58*(7+6) =754

    Your puzzle:

    8*5 = 40+7 = 47*10 = 470+5+3 = 478

    100 8 5 4 4 1
    657


  • #3388
    Niska
    Registered Users, Registered Users 2 Posts: 2,487 ✭✭✭Niska


    Wanderer2010 wrote: »
    Hard luck on my puzzle. Im afraid I only had a single 6 in it. Here is another way around it:

    7*8=56+2 = 58*(7+6) =754

    Bit of a brain fart there - sorry.
    Wanderer2010 wrote: »
    100 8 5 4 4 1
    657

    100 + (8 * 4) = 132 * 5 = 660 - 4 + 1 = 657

    ======================

    6, 7, 9, 10, 50, 100

    Target: 589


  • #3389
    Wanderer2010
    Registered Users, Registered Users 2 Posts: 6,743 ✭✭✭Wanderer2010


    Niska wrote: »
    Bit of a brain fart there - sorry.



    100 + (8 * 4) = 132 * 5 = 660 - 4 + 1 = 657

    ======================

    6, 7, 9, 10, 50, 100

    Target: 589

    6*100=600
    7-(50/10)=2+9=11
    600-11=589

    25 6 3 7 5 4
    661


  • #3390
    Ciaran
    Registered Users, Registered Users 2 Posts: 980 ✭✭✭Ciaran


    Wanderer2010 wrote: »
    6*100=600
    7-(50/10)=2+9=11
    600-11=589

    25 6 3 7 5 4
    661

    (4*25-6)*7 + 3 = 661

    2 4 6 8 9 75
    684


  • Advertisement
  • #3391
    Niska
    Registered Users, Registered Users 2 Posts: 2,487 ✭✭✭Niska


    Ciaran wrote: »
    2 4 6 8 9 75
    684

    (75 + ((6 - 4) /2)) = 76 * 9 = 684

    ===================

    3,4, 7, 10, 25, 100

    Target: 460


Advertisement