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

A. 120
B. 240
C. 360
D. 480

Answer: Option C

Explanation:

2 | 24  - 36  - 40
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2 | 12  - 18  - 20
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2 |  6  -  9  - 10
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3 |  3  -  9  -  5
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  |  1  -  3  -  5
   
L.C.M.  = 2 x 2 x 2 x 3 x 3 x 5 = 360.