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280.

You break them down to their prime factorization

5 = 5

7 = 7

8 = 2 x 2 x 2

Multiply each one without repeating a number if it appears in two locations- as in it appears in two different numbers factorization (not a problem here since both 5 and 7 are prime)

5 x 7 x 2 x 2 x 2 = 240

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14y ago

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