5.The least number which is a perfect square and is divisible by each of the numbers 16, 20 and 24, is:
[A] 1600
[B] 3600
[C] 6400
[D] 14400
Answer : [B]
Explanation :
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The least number divisible by 16, 20, 24 = L.C.M. of 16, 20, 24 = 240 = 2 x 2 x 2 x 2 x 3 x 5
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To make it a perfect square, it must be multiplied by 3 x 5
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Required number = 240 x 3 x 5 = 3600
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