The students of Class VIII of a school donated Rs 2401 in all, for Prime Minister’sNational Relief Fund. Each student donated as many rupees as the number of students in the class. Find the number of students in the class.

2025 plants are to be planted in a garden in such a way that each row contains asmany plants as the number of rows. Find the number of rows and the number of plants in each row.

Find the smallest square number that is divisible by each of the numbers 4, 9 and 10.

Find the smallest square number that is divisible by each of the numbers 8, 15 and 20.

Find the least number which must be subtracted from 825 so as to get a perfect square.

Find the least number which must be added to 6412 so as to get a perfect square.

Find the length of the side of a square whose area is 441 m².

In a right triangle ABC, ÐB = 90°.If AC = 13 cm, BC = 5 cm, find AB

A gardener has 1000 plants. He wants to plant these in such a way that the numberof rows and the number of columns remain same. Find the minimum number of  plants he needs more for this.

There are 500 children in a school. For a P.T. drill they have to stand in such a manner that the number of rows is equal to number of columns. How many children would be left out in this arrangement.