1. 

The area of playground is 1600 m2. What is the perimeter?

I. It is a perfect square playground.

II. It costs Rs. 3200 to put a fence around the playground at the rate of Rs. 20 per metre.

A. I alone sufficient while II alone not sufficient to answer
B. II alone sufficient while I alone not sufficient to answer
C. Either I or II alone sufficient to answer
D. Both I and II are not sufficient to answer
E. Both I and II are necessary to answer

Answer: Option C

Explanation:

Area = 1600 m2.

 I. Side = 1600 m = 40 m. So, perimeter = (40 x 4) m = 160 m.

∴ I alone gives the answer.

II. Perimeter = Total cost = 3200 m = 160 m.
Cost per metre 20

∴ II alone gives the answer.

∴ Correct answer is (C).