Find the LCM and HCF of 27 and 81.

The difference between the greatest and least prime numbers which are less than 100 is:

The LCM of two numbers is 1920 and their HCF is 16. If one of the numbers is 128, find the other number.

The HCF of two numbers 12906 and 14818 is 478. Their LCM is

The smallest five digit number which is divisible by 12, 18 and 21 is:

If , and , then what is the least common multiple of A, B and C?

Three bells ring at interval of 36 seconds, 40 seconds and 48 seconds respectively. They start ringing together at a par- ticular time They will ring to gether after every