If the highest common factor (HCF) of x and y is 15, then the HCF of 36x² – 81y² and 81x² – 9y² is divisible by __________

The LCM of two numbers is 495 and their HCF is 5. If the sum of the numbers is 100, then their difference is: 

Find the HCF of 306, 204 and 136.

There are 24 peaches, 36 apricots and 60 bananas and they have to be arranged in several rows in such a way that every row contains the same number of fruits of only one type. What is the minimum number of rows required for this to happen? 

If the least common multiple of two numbers, 1728 and K is 5184, then how many values of K are possible? 

A number of friends decided to go on picnic and planned to spend Rs. 108 on eatables. Three of them however did not turn up. As a consequence, each one of the remaining had to contribute Rs 3. extra. The number of them who attended the picnic was:

The ratio of two numbers is 4:5 and their LCM is 120. The numbers are

The least number to be subtracted from 36798 to get a number which is exactly divisible by 78 is