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4

Find the least square number which is exactly divisible by 10,12,15 and 18.

A. 999

B. 900

C. 899

D. 987

Correct Answer :

B. 900


       L.C.M. of 10, 12, 15, 18 = 180. Now, 180 = 2 * 2 * 3 * 3 *5 = 22 * 32 * 5.


       To make it a perfect square, it must be multiplied by 5.


        Required number = (22 * 32 * 52) = 900.

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B. 1.2933..

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A. 32

B. 56

C. 52

D. 50

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B. .003

C. 3

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C. 3/4

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C. 9

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A. 170

B. 170/11

C. 123

D. 123/11

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Simplify: [( 12.1 )2 - (8.1)2] / [(0.25)2 + (0.25)(19.95)]

A. 6

B. 3

C. 4

D. 8