Find the greatest number 23a68b, which is divisible by 3 but NOT divisible by 9.

Find the maximum number of students among them 1001 pens and 910 pencils can be distributed in such a way that each student gets the same number of pens and same number of pencils.

Two numbers, of which the first number is 200% of the second number. If the sum of the squares of the first number and the cube of the second number is 5 times the product of both numbers, find the difference between the two numbers?

In a class, there are ' z ' students. Out of them ‘x’ are boys. What part of the class is composed of girls? 

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

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

Directions: Find the wrong number in the following number series:

141, 156, 147, 162, 153, 165, 159

Evaluate 743 x 999.