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
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

Problem solving using algebra

  • 04-03-2014 8:56pm
    #1
    12dlsam
    Registered Users, Registered Users 2 Posts: 5 ✭


    A metal alloy is 30% nickel. Another metal alloy is 70% nickel. The two alloys are mixed to produce 20kg of a metal alloy that is 48% nickel. How much of each metal alloy is used?"

    Can anyone help me in writing out this equation please


Comments

  • #2
    Pherekydes
    Registered Users, Registered Users 2 Posts: 16,202 ✭✭✭✭Pherekydes


    Let x equal the mass of 30% nickel alloy and y equal the mass of 70% nickel alloy.

    Then,

    x+y = ?

    0.3x + 0.7y = ?

    Can you fill in and solve?


  • #3
    12dlsam
    Registered Users, Registered Users 2 Posts: 5 ✭12dlsam


    so x + y = 20
    0.3x + 0.7y =0.48
    ??? simultaneous equations from here??


  • #4
    Pherekydes
    Registered Users, Registered Users 2 Posts: 16,202 ✭✭✭✭Pherekydes


    12dlsam wrote: »
    so x + y = 20
    0.3x + 0.7y =0.48
    ??? simultaneous equations from here??

    Your second equation should read

    30% of something (x) plus 70% of something (y) equals 48% of ??

    Once you correct the right hand side you can easily solve using simultaneous equations.


  • #5
    12dlsam
    Registered Users, Registered Users 2 Posts: 5 ✭12dlsam


    Got it, thanks a million for all your help.


Advertisement