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Alex is thinking of a double fact. The sum is greater than the sum of 7+7 but less than the sum of 8+9. What fact is Alex thinking of?

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  1. 15 May, 15:03
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    Use an inequality:

    S = sum

    7 + 7 < S < 8 + 9

    14 < S < 17

    so the sum is between 14 and 17
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