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Laughy · Answer 1 · 2022-07-05T16:30:44+0000

9514 1404 393

Answer:

60

Explanation:

The minimum number required is the least common multiple (LCM) of 15 and 4. The numbers 15 and 4 have no common factors, so their LCM is their product.

15×4 = 60 strands are required

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