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26 October, 05:11

Elena and her grandfather both just had birthdays last week. The sum of their ages is 100 years. Her grandfather's age is 4 times Elena's age. How old are Elena and her grandfather?

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  1. 26 October, 05:22
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    Grandfather age = 20 * 4 = 80

    Step-by-step explanation:

    Let Elena age be x

    grandfather age is 4x

    x + 4x = 100

    5x = 100

    x = 100/5 = 20 = Elena age
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