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Three fourth of the number of girls in a school is equal to half of the number of the boys.if the school has 1420 pupils.how many of them are boys.

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  1. b+g = 1420
    3g/4 = b/2

    . . .

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  2. B+g=1420 ' 3g/4=b/2
    B=1420-g ' 3g/4=1420-g/2
    B=1420-568 4×3g/4=4×1420-g/2
    B=852 3g=2840-2g
    3g+2g=2840
    5g=2840
    G=2840/5
    G=568

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  3. Total pupils = 1420
    Let boys be x
    so girls are 1420-x
    ATQ
    ¾(1420-x) =½(x)
    1065-¾(x)=½(x)
    1065=(2x+3x)4
    1065=5x/4
    1065×4÷5
    =852 boys

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  5. mali

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