Question

there is a swimming pool, 3 meters in width and 4 meters in length. the owner wants to built a uniform deck around the swimming pool which is 3 times of the area of the pool. what's the width of the deck?

Answer 1

If the area of the deck is 3 times the pool, then the total area of pool+deck is 4 times just the pool.

If the width of the deck is w, you need

(3+2w)(4+2w) = 4(3)(4)

Answer 2

36