Chapter 10 - Arithmetic Progression Exercise Ex. 10(E)

Question 1

Two cars start together in the same direction from the same place. The first cargoes at uniform speed of 10 km h^-1. The second car goes at a speed of 8 km h^-1 in the first hour and thereafter increasing the speed by 0.5 km h^-1 each succeeding hour. After how many hours will the two cars meet?

Let the two cars meet after n hours, then

 

Solution 1

Question 2

A sum of Rs. 700 is to be paid to give seven cash prizes to the students of a school for their overall academic performance. If the cost of each prize is Rs. 20 less than its preceding prize; find the value of each of the prizes.

Solution 2

 

Question 3

An article can be bought by paying Rs. 28,000 at once or by making 12 monthly installments. If the first installment paid is Rs. 3,000 and every other installments is Rs. 100 less than the previous one, find :

(i) amount of installments paid in the 9^th month

(ii) total amount paid in the installment scheme

Solution 3

Question 4

A manufacturer of TV sets produces 600 units in the third year and 700 units in the 7^th year. Assuming that the production increases uniformly by a fixed number every year find:

(i) the production in the first year.

(ii) the production in the 10^th year.

(iii) the total production in 7 years.

Solution 4

Since the production increases uniformly by a fixed number every year, he sequence formed by the production in different years is an A.P.

Let the production in the first year = a

Common difference = Number of units by which the production increases every year = d

Question 5

Mrs. Gupta repays her total loan of Rs. 1,18,000 by paying installments every month. If the installments for the first month is Rs. 1,000 and it increases by Rs. 100 every month, What amount will she pays as the 30^th installments of loan? What amount of loan she still has to pay after the 30^th installments

Solution 5