Question

Find the smallest no.of 5digits which is exactly divisible by12,16,20

Answer 1

12-1,2,3,4,6,12
16-1,2,4,8,16
20-1,2,4,5,10,20

this shows that 2 and 4 are occuring in three no. so 2 and 4 are no. which exactly divisible by all these numbers.


hope this will help .....!!!!!

Answer 2

Take the LCM of 12,16,20i.e 240. Then divide it to smallest five digit number i. e. 10000.remainder will be 80.so add 80to 10000=10080 which is divisible by the three.