The ratio of pens to pencils is 5 to 6. There are 4 more pencils than pens. How many pencils are there?  Choose the correct choice
A) 12
B) 16
C) 20
D) 24
E) 28

Rationale: "let the number of pens be 5 x and the number of pencils be 6 x . 6 x - 5 x = 4 x = 4 the number of pencils is 24 . the answer is d ."
Answer: D