BBC maths test..

jackdaw

http://news.bbc.co.uk/today/hi/today/newsid_7558000/7558786.stm

Maths made interesting ... BS ....


the most stupid maths test you will ever do ... what colour is the bear ... F-CK OFF!!!

Spear

jackdaw wrote: »

http://news.bbc.co.uk/today/hi/today/newsid_7558000/7558786.stm

Maths made interesting ... BS ....


the most stupid maths test you will ever do ... what colour is the bear ... F-CK OFF!!!

Damn it, I only got the bear one right.

Pherekydes

Haha, I got the probability ones right, plus the bear. Didn't bother to work out the equator one, just guessed, so 4/6.

Yakuza

I'd seen circumference one before, and the cool thing is, the answer would be the same if you had a rope around a tennis ball or a planet:

Let R = Radius of original circle
Let R' = Radius of new circle with the extra metre of rope

Thus 2ΠR be the circumference of the original circle (or the length of the rope). The new length is 2ΠR +1, which would be the circumference of a circle with radius (2ΠR +1) / 2Π, or R' = R +1/2Π

Taking away the original R, you're left with the increased radius of 1/(2Π), or 15.91cm.
As I said, this is independent of the original R, so adding a metre to a rope around a tennis ball, football, beach ball or a planet, will create a circle with a radius of 16cm larger.

nothing

The mirror one has me a bit confused. Surely moving away from the mirror will let you see more?

Grudaire

nothing wrote: »

The mirror one has me a bit confused. Surely moving away from the mirror will let you see more?

Not if its flat. It's to do with the greatest angle you can see decreasing as you move away, try drawing a line showing how light travels form b to B via c, then from a to A via c. Imaging c is the bottom of the mirror..

a..................................b


.......................................................c


A..................................B

(Doesn't hold spaces...)

Jay P

2 out of 6! First and last one were right, but the part with the birthdays, I didn't really get that

Canape

Why does it show what looks like a curved mirror in the picture for the mirror one? Threw me right off

Pherekydes

Jay P wrote: »

2 out of 6! First and last one were right, but the part with the birthdays, I didn't really get that

It's a well known problem in probability.

Birthday paradox

Canape

Something good has come out of this quiz though. I have now heard of Benford's Law, and it's damn interesting stuff. Good show, mathematics, good show!

longshanks

Yakuza wrote: »

I'd seen circumference one before, and the cool thing is, the answer would be the same if you had a rope around a tennis ball or a planet:

Let R = Radius of original circle
Let R' = Radius of new circle with the extra metre of rope

Thus 2ΠR be the circumference of the original circle (or the length of the rope). The new length is 2ΠR +1, which would be the circumference of a circle with radius (2ΠR +1) / 2Π, or R' = R +1/2Π

Taking away the original R, you're left with the increased radius of 1/(2Π), or 15.91cm.
As I said, this is independent of the original R, so adding a metre to a rope around a tennis ball, football, beach ball or a planet, will create a circle with a radius of 16cm larger.

so its enough for the kids to crawl under one at a time. i think most people assumed that it meant all the kids together

MathsManiac

longshanks wrote: »

so its enough for the kids to crawl under one at a time. i think most people assumed that it meant all the kids together

It does mean all together. Why do you now suggest that that is not what's intended?

jackdaw

Here's another sh*t one ..

http://news.bbc.co.uk/today/hi/today/newsid_7699000/7699177.stm


0/5 .. guess im sh't at maths,,, A in LC + engineering degree doesn't say so,,

drunk_monk

jackdaw wrote: »

Here's another sh*t one ..

http://news.bbc.co.uk/today/hi/today/newsid_7699000/7699177.stm


0/5 .. guess im sh't at maths,,, A in LC + engineering degree doesn't say so,,

I got 4 out of 5 on this one by guessing all the answers what's the probability of that

Pherekydes

drunk_monk wrote: »

I got 4 out of 5 on this one by guessing all the answers what's the probability of that

Nearly 98%.

I got 2.

Mellor

jackdaw wrote: »

Here's another sh*t one ..

http://news.bbc.co.uk/today/hi/today/newsid_7699000/7699177.stm


0/5 .. guess im sh't at maths,,, A in LC + engineering degree doesn't say so,,

Some of them are worded badly, the hexagon/cube one for example.
I took it as a cut from finger to finger. Depending on whic way you cut it, you could get 3, 4 or 6 sides