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28 January, 03:54

Robert is 15 years older than his sister, Helen. The sum of their ages is 63. Find their ages.

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  1. 28 January, 04:07
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    Helen is 24; Robert is 39

    Step-by-step explanation:

    If Helen's age is x, Robert's age is x + 15. We can write:

    x + x + 15 = 63

    2x + 15 = 63

    2x = 48

    x = 24

    This means that Helen's age is 24 and Robert's age is 24 + 15 = 39.
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