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

When a positive integer n is divided by 5 the remainder is 2. What is the remainder when the number 3n is is divided by 5 ?

The product of two numbers is 45 and their difference is 4. The sum of squares of the two numbers 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? 

What will be come in place of question mark(?) in the following number series?
13 , 14 , 30 , 93, ?, 1885

What is the smallest number of 5 digits which is exactly divisible by 12, 24, 48, 60 and 96?

x is a five - digit number. The digit in ten thousand's place is 1. The number formed by its digits in unit's and ten's places is divisible by 4. The sum of all the digits is divisible by 3 . If 5 and 7 also divide x, then x will be: 

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?