Find the greatest number which will exactly divide 200 and 320. 

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

The sum of two numbers is 84 and their HCF is 12. Total number of such pairs of number is 

A General of an Army wants to create a formation of square from 36562 army men. After arrangement, he found some army men remained unused. 

Three bells ring simultaneously at 11 a.m. They ring at regular intervals of 20 minutes, 30 minutes, 40 minutes respectively. The time when all the three rings together next is:

The LCM of two positive integers is twice the larger number. The difference of the smaller number and the GCD of the two numbers is 4. The smaller number is: 

The number of pairs of positive integers whose sum is 99 and HCF is 9 is: 

The HCF of 156, 312 and 195 is :