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1. Find the lowest common multiple of 24, 36 and 40.

A. 120

B. 240

C. 360

D. 480

Solution:

\begin{aligned} 2 | 24 - 36 - 40 \\ - - - - - - - - - - - - - \\ 2 | 12 - 18 - 20 \\ - - - - - - - - - - - - - \\ 2 | 6 - 9 - 10 \\ - - - - - - - - - - - - - \\ 3 | 3 - 9 - 5 \\ - - - - - - - - - - - - - \\ | 1 - 3 - 5 \\ L . C . M = 2 \times 2 \times 2 \times 3 \times 3 \times 5 = 360 \end{aligned}

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