13. Divide 96 into four parts which are in A.P. and the ratio between the product of their means and the product of their extremes is 15 : 7.

1.   Divide 96 into four parts which are in A.P. and the ratio between the product of their means and the product of their extremes is 15 : 7.

12. The angles of a quadrilateral are in A.P. with common difference 20 degree. Find its angles.

   The angles of a quadrilateral are in A.P. with common difference 20 degree. Find its angles.

11. The sum of the three consecutive numbers of an A.P. is 21 and the sum of their squares is 165. Find these terms.

1.   The sum of the three consecutive numbers of an A.P. is 21 and the sum of their squares is 165. Find these terms.

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10. Find the sum of 7 lying between 300 and 700.

 Find the sum of 7 lying between 300 and 700.

Find the sum of : (i) All odd natural numbers smaller than 50. (ii) First 12 natural numbers that are multiples of 7.

 Find the sum of :

(i)              All odd natural numbers smaller than 50.

(ii)           First 12 natural numbers that are multiples of 7.

Find the sum of the first 22 terms of the A.P. : 1, 3, -2, …………….

1.   Find the sum of the first 22 terms of the A.P. :

1, 3, -2, …………….

7. How many three digit numbers are divisible by 87?

   How many three digit numbers are divisible by 87?