Aptitude Hack#140(13-07-19)

Question:

The least perfect square, which is divisible by each of 15, 20 and 36 is:

A) 1200
B) 800
C) 1000
D) 900

Answer: D) 900.

Explanation:

LCM of 15, 20 and 36 is 180

Now 180 = 3 x 3 x 2 x 2 x 5
As we want a perfect square It must product of Squares. 
To make it perfect square, we must Multiple LCM by 5.

So, 180*5=900.