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20 September, 03:21

When kara and Lauren add their ages, the sum is 20 when they multiply their ages, the product is 99 what is difference in their ages?

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  1. 20 September, 04:56
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    X+y=20

    xy=99

    Let a+b be denoted a, b

    20 = 1,19 2,18 3,17 4,16 5,15, 6,14 7,13 8,12 (9,11) ... Stop

    99=3^2*11

    Thus the ages are 11 and 9 with a difference of 2.
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