mathematics

there are 5 more girls than boys in a class. if 2 boys join the class, the ratio of girls to boys is 5:4. find the number of girls in the class.

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  1. right now:
    boys --- x
    girls --- x+5

    2 boys join class:
    boys = x+2
    girls = x+5

    (x+2)/(x+5) = 5/4
    solve for x , sub into x+5

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  2. x=17

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  3. x = 17

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  4. The answer had was x=10
    B=x,two boys jointed boys became B=x+2,G=x+5.The ratio is girls to boys ie g:b;x+5:x+2=5:4
    X+5/x+2=5/4 using cross multiply
    4(x+5)=5(x+2)=4x+20=5x+10
    5x-4x=20-10
    X=10

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  5. The answer I had was x=10
    B=x,two boys jointed boys became B=x+2,G=x+5.The ratio is girls to boys ie g:b;x+5:x+2=5:4
    X+5/x+2=5/4 using cross multiply
    4(x+5)=5(x+2)=4x+20=5x+10
    5x-4x=20-10
    X=10

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    2. 👎
  6. x+12/x+2=5/4
    4x+48=5x+10
    4x-5x=10-48
    x=38
    Therefore the number of girls is
    38+5+7=50

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  7. By going through the second and third solution, i believe it is have a bit error's

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