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

A. 1600
B. 900
C. 3600
D. 2500

B. 900

L.C.M of 10, 12,15, 18

Answer will be 180.

Factors of 180 are: 2*2*3*3*5

or 

2² * 3³ *5

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

Required number:

= 2² * 3² *5²

= 900 (Answer)

 

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