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math

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Sanjeev is twice as old as his son.If after four years he will be four times as old as his son was 9 years ago ,how old is each now ??

  • math -

    present:
    son --- x
    father --- 2x

    in four years:
    son x+4
    father 2x+4

    9 years ago:
    son -- x-9
    father -- 2x-9

    2x+4 = 4(x-9)
    2x+4 = 4x-36
    -2x = -40
    x=20

    son is now 20 , and the father is now 40

    check:
    in 4 years:
    son is 24
    father is 44

    9 years ago:
    son was 11
    father was 30

    is 44 four times 11 ? YES

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