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3 June, 12:53

Four times daphne's age plus five times isaac's age adds up to 57. also, isaac's age is 11 less than twice daphne's age. how old is isaac?

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  1. 3 June, 13:17
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    4d + 5i = 57

    i = 2d - 11

    4d + 5 (2d - 11) = 57

    4d + 10d - 55 = 57

    14d = 57 + 55

    14d = 112

    d = 112/14

    d = 8 < = = Daphne's age

    i = 2d - 11

    i = 2 (8) - 11

    i = 16 - 11

    i = 5 <==Isaac's age
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