Need help with my nephew's Maths question please?

Need help with my nephew's Maths question please?

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MHO would be selected.

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  • 668

    hopefully I didn t do any calculations mistakes

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    • Could you please show me the steps because I need to explain it to him. Thanks so much!

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    • Thanks for tour help! :-)

    • your*

What Guys Said 5

  • M+W=4586.
    W+R=1321
    M=6R
    Solve for W.
    Substituting for M,
    6R+W=4586
    Solving for W in second equation.
    W=1321-R
    Substituting
    6R+(1321-R)=4586
    Solve for R
    5R+1321=4586
    5R=3265
    R=653.
    Solving for W in second equation
    W+653=1321
    W=668

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  • i came up with a good 623... approximately

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    • Could you please show me the steps so that I could explain it to my niece? Thanks so much!

    • what if im wrong?

  • Hi! This is using algebra to model the situation.
    M is Michelle's money
    R is Rachel's money
    W is Wei Yi's money

    Things we know:
    M = 6R

    A) W + R = 1321
    B) W + M = 4386

    As M = 6R, we can multiply A) by 6 to get

    6R + 6W = 7926

    and sub in M for 6R

    M + 6W = 7926

    Now take away M + W = 4586 to get

    5W = 3340

    divide by 5

    W = 668

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  • y + x = 4586
    y + z = 1321
    x = 6z

    y = 4586 - 6z
    4586 - 6z + z = 1321
    5z = 3265
    z = 653
    y = 668

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  • Lets assign variables to name for our own ease

    Michelle = A
    WeiYi = B
    Rachel = C

    according to given details we get

    A + B = 4586 eq.1
    B + C = 1321 eq.2
    A= 6C eq.3
    B= ?

    from eq 2

    B = 1321 - C eq.4

    from eq 1
    B = 4586 - A but also A = 6C So,
    B = 4586 - 6C now compare it with eq.4 to get value of C

    1321 - C = 4586 - 6C rearrange
    6C - C = 4586 -1321
    5C = 3265
    C = 3265/5 = 653 PUT THIS VALUE OF C EQ.2

    B + (653) = 1321
    B = 1321 - 653 = 668
    SO B=668

    Hence WeiYi saved $ 668

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    • i dnt why it is posted as anonymous :/

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