Answer
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Step-by-step explanation
The only way the two stores can sell the same number of necklace charms, given that the two stores sell them in packs of 10 and 15 necklace charms, is for them to sell the same number of necklace charms is for them to sell a common multiple of 10 and 15. The multiples of 10 and 15 are
10, 20, 30, 40, 50, 60, 70, 80, 90
15, 30, 45, 60, 75, 90, 105, 120
30, 60, 90, 120 etc
So, if the answers are available, the answer is one of the common multiples of 10 and 15.
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