A Farmer Wants to Enlarge an Existing Rectangular Pig Pen

Multiple Choice

A farmer wants to enlarge an existing rectangular pig pen such that the total area of the new pen is twice as large as the original pen. The current pen's dimensions are 21' × 32'. The farmer wants to add 9 feet more to the long side than to the the short side. Find the dimensions of the new pen.

A) 7 feet × 16 feet
B) 28 feet × 48 feet
C) 28 feet × 39 feet
D) 28 feet × 37 feet
E) 28 feet × 41 feet