Question

Find the greatest 3digit number which is exactly divisible by 9,15 and 18.

Answer 1

The greatest three digit number which is exactly divisible by 9,15 and 18 is 720

Answer 2

LCM of 9,15and 18 is 90
The largest three-digit number = 999
We have 999 ÷ 90
= Q= 99,R= 9
Since the remainder is 9,so,if we subtract 9 from 999,we get the largest three-digit number divisible by 9,15 and 18,i.e.,999-9= 990.

Hence, the required number is 990.