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math

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if a boy is 4 years less than twice his sisters age and the sum of the age is 11 how old is he

  • math -

    go through each of the possibilities of getting to 11. 1+10 2+9 3+8 4+7 and so on. think of what you are looking for, twice the girls age will be four more than the boys age.

  • math -

    or, using algebra
    b+s=11
    b=2s-4

    2s-4+s=11
    3s=15
    s=5
    so, b=6

    check:
    6=2*5-4

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