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

The value of (81)3.6 * (9)2.7/ (81)4.2 * (3) is __

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

Find the least number which when divided by 12, 15, 18 and 27 leaves remainders 10, 13, 16 and 25 respectively.

Evaluate 743 x 999.

If a shopkeeper buys 2 oranges for Rs.5 and sells 3 for Rs.7 only, then what percentage of loss and loss did he gain?

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?

The product of two consecutive even numbers is 168. Find the sum of the numbers?