What is the smallest number of chairs that can be arranged in rows of 12 or 15?

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120

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Solution

The correct option is D 60
To find the smallest number of chairs that can be arranged in either 12 or 15 rows, we find the LCM of 12 and 15.

$\begin{matrix} 2 & 12, 15 3 & 6, 15 2 & 2, 5 5 & 1, 5 1, 1 \end{matrix}$
LCM = 2 × 3 × 2 × 5
= 60

60 chairs is the minimum number of chairs that can be arranged in either 12 rows or 15 rows completely.

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