A rectangular swimming pool is 10 feet by 12 feet. A deck that has uniform width surrounds the pool. The total area of the pool and deck is 360 square feet. What is the width of the deck? Choose the correct choice from the following:
A) 7	B) 2	C) 3	D) 4	E) 6
Let the width =W   Total Area of the pool and deck= (2W+10)(2W+12)   We can Test the answer choices along with unit digit method   A) 2 feet ...........14*16 has unit digit 4..........Eliminate   B) 2.5 feet.........15*17 has unit digit 5..........Eliminate   C) 3 feet............16*18 has unit digit 8...........eliminate   4) 4 feet............18*20 has unit digit 0...........hold   E) 5 feet............20*22 has unit digit 0...........Eliminate ( bigger size)   Answer:4 w=4
<result>D</result>
A rectangular swimming pool is 10 feet by 12 feet. A deck that has uniform width surrounds the pool. The total area of the pool and deck is 360 square feet. What is the width of the deck?