(Q.1).Two situations are given below:

(i) The cost of 1 kg potatoes and 2 kg tomatoes was Rs. 30 on a certain day. After two days, the cost of 2 kg potatoes and 4 kg tomatoes was found to be Rs. 66.

(ii) The coach of a cricket team of M.K. Nagar High School buys 3 bats and 6 balls for Rs. 3900. Later he buys one more bat and 2 balls for Rs. 1300.

Identify the unknowns in each situation. We observe that there are two unknowns in each case.

(i) The unknowns in the first problem are

(a) cost of 1kg tomatoes and 2kg potatoes
(b) cost of 1kg tomatoes and 1kg potatoes
(c) cost of 2kg tomatoes and 1kg potatoes
(d) cost of 2kg tomatoes and 2kg potatoes

(ii) In the second problem, the unknowns are

(a) cost of 1 bat and 2 balls
(b) cost of 1 bat and 1 ball
(c) cost of 2 bats and 1 balls
(d) cost of 2kg tomatoes and 2kg potatoes