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Question

Which of the following is a multiple of both 5 and 15?

A
35
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B
55
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C
45
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D
20
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Solution

The correct option is C 45
45=5×9
45=15×3

35, 55 and 20 are multiples of 5, but not of 15 and therefore, are not common multiples of 5 and 15.

Hence, 45 is a common multiple of 15 and 5.

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