The sum of three consecutive numbers is 87. The middle number is : 

Find the greatest number which divides 108, 124 and 156, leaving the same remainder. 

Two numbers are such that their difference, their sum and their product is in the ratio of 1: 7: 24. The product of numbers is

In a two - digit number, the digit at the unit's place is 1 less than twice the digit at the ten's place. If the digits at units and ten's place are interchanged, the difference between the new and the original number is less than the original number by 20. The original number is: 

If the sum of first three natural numbers from a group of six consecutive natural numbers is 36, then the sum of last three natural numbers will be? 

Amit ranked 7th from the top and 26th from the bottom in his class. How many students are there in the class?

Find the difference between mean and median in the given data 2.5, 4.6, 7.2, 3.3, 4.9, 5.6, 2.7?

The greatest 4-digit number which is a perfect square is