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

A number consists of two digits. If the number formed by interchanging the digits is added to the original number, the resulting number (i.e. the sum) must be divisible by

The sum of the digits of a two digit number is 15. When 9 is subtracted from the given number then its digits interchanged. What will be the required original number?

Direction : What value should come in place question mark(?) in the following questions?

$$ 4{7\over 8}$$ - $$ 2{1\over 2}$$+$$ 1{3\over 4}$$=?

The average of six consecutive odd numbers is 26. Find the difference between the largest and the smallest of these numbers.

On dividing a certain number by 342 we get 47 as remainder. If the same number is divided by 18, what will be the remainder?

Adding 335 to 5A7 results in 8B2. The number 8B2 is divisible by 3. Accordingly, what will be the maximum possible value of A?

many times will the buttons of a typewriter be pressed to write the numbers 121 to 1346?