If the average of r, b, c, 14 and 15 is 12. What is the average value of r, b, c and 29
Choose the correct answer: A) 12 B) 13 C) 14 D) 15 E) 16

Rationale: r + b + c + 14 + 15 = 12 * 5 = 60 = > r + b + c = 60 - 29 = 31 r + b + c + 29 = 31 + 29 = 60 average = 60 / 4 = 15 answer d
Answer: D