The average of 21 consecutive natural numbers is 53. What is the value of the smallest of these 21 numbers?

Twenty-one time of a positive number is less than its square by 100. The value of the positive number is

The east positive integer that should be subtracted from 3011 x 3012 so that the difference is a perfect square is-

A person gives 1/4  of his property to his daughter, 1/2  to his sons and 1/5 for charity. How much has he given away?

1/5 of a number exceeds 1/7 of the same number by 10. The number is:

A rod of length 85 m is divided into two parts if the first part of the rod is 2/3 of the second part then the larger part (in metres) is.

Three different containers contain 130 liter, 442 liter and 234 liter of milk, respectively. What biggest measure can be used to measure all the containers exactly?

Evaluate 743 x 999.