Question

Find the smallest square number that is divisible by 8, 12,

15 and 20.

Answer 1

the answer is 4 which is divisible by 8,12 and square of 2

Answer 2

Find the smallest square number that is divisible by 8, 12, 

15 and 20

lcm of  8, 12, 

15 and 20

=> 8 = 2*2*2

=>12 = 2*3*2

=>15 = 3*5

= > 20 = 2*2*5

now lcm  = 2*2*2*3*5

 Now for it to be a perfect square, it should have even powers

so

2*2*2*2*3*3*5*5

= 3600 

:)