Question

Find the smallest square no. divisible by 8,15,20?

Answer 1

Just take the LCM of 8,15,20 and then you will get the LCM as 120
then factorise it you will get 2*2*2*3*5.
Now multiply this with 2*3*5 since they  are incomplete. 
Thus you will get the answer as 3600