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21 July, 10:21

Joanne and Betty have a combined age of 60 years. If Joanne is 18 years old,

how old is Betty?

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  1. 21 July, 14:03
    0
    42

    Step-by-step explanation:

    Let Joanne age be x

    let betty age by y

    . °. x + y = 60

    if joanne is 18

    y = 18

    x + 18 = 60

    x = 60 - 18

    x = 42

    . °. betty = 42
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