A rectangular swimming pool is 20 feet by 22 feet. A deck that has uniform width surrounds the pool. The total area of the pool and deck is 728 square feet. What is the width of the deck?  Answers:	A) 2	B) 4	C) 3	D) 5	E) 6
Let the width =W   Total Area of the pool and deck= (2W+20)(2W+22)   We can Test the answer choices along with unit digit method   A) 2 feet ...........24*26 has unit digit 8..........Eliminate   B) 2.5 feet.........25*33 has unit digit 5..........Eliminate   3) 3 feet............26*28 has unit digit 4...........Hold   D) 4 feet............28*30 has unit digit 0...........Eliminate   E) 5 feet............30*32 has unit digit 0...........Eliminate   Answer: 3 w=3
<result>C</result>
A rectangular swimming pool is 20 feet by 22 feet. A deck that has uniform width surrounds the pool. The total area of the pool and deck is 728 square feet. What is the width of the deck?