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The necklace depot sells necklace charms in packs of 10 the lovely necklace sails necklace charms in packs of 15 at the end of the day both stores sold the same number of necklace charms which of the following could be the number of charms sold that day

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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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