Question

Find the last number day is divisible by 3,4,5,6,10 and 15

Answer 1

to find the last number divisible by 3, 4, 5, 6, 10 and 15 we have to find the lcm of these numbers 
3=1*3
4=2*2
5=1*5
6=3*2
10=5*2
15=3*5
lcm of all the given numbers=3*2*2*5*3*2*5*2*3*5=54000
hence the number is 54000