The sum 9 + 16 + 25 + 36 +_______+ 100 is equal to?

The digit in unit’s place of the product 81 × 82 × 83 × ... × 89 is

Find the sum of all prime numbers between 10 and 90.

The sum of all natural numbers between 100 and 200. Which are multiple of 3 will be: 

The total cost of 18 pens and 23 pencils is Rs. 231, while the total cost of 7 pens and 13 pencils is Rs. 102. What is the cost of 4 pens and 9 pencils?

The smallest number which when divided by 18, 24, 38 and 42 leaves the remainder 15, 21,     35 and 39 respectively is :-

The average of five natural numbers is p. If the next three numbers are included then how much the average of these 8 numbers exceeds than the average p?

If 2A = 3B = 7C = 42, then what is the value of A × B ÷ C?