Question

The smallest no which is divisible by 12,15,20 and is perfect square is

Answer 1

12 = 2 x 2 x 3

15 = 3 x 5

20 = 2 x 2 x 5

So, LCM = 2 x 2 x 3 x 5 = 60

As 3 and 5 are not in pair in LCM’s factor so we need to multiply 60 by 5 and 3 to make it a perfect square.

Required Smallest Number = 60 x 3 x 5 = 900.


HOPE IT HELPED U MATE!!!!

Answer 2

the smallest number which is divisible by 12, 15, 20
12= 2×2×3
15=3×5
20=2×2×5
lcm= 2×2×3×5 =60
so 3and 5 are not pair of lcm factor
so 60×3×5 =900