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17 September, 14:33

Sarah and her brother are 6 years apart. Right now, the ratio of their ages is 3:4. How old are both of them right now?

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  1. 17 September, 14:53
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    Sarah: 18

    Brother: 24

    Step-by-step explanation:

    The difference in ratio units is 4-3 = 1. The difference in years is 6, so 1 ratio unit stands for 6 years.

    Multiplying by 6, we have ...

    ... Sarah : Brother = 3·6 : 4·6 = 18 : 24

    Sarah is 18; her brother is 24.
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