TASK DEFINITION: Given a math problem with context and a question and 5 answer choices, the task is to provide the correct answer choice based on the problem. You must choose one of the given answer choices by letter: a, b, c, d, or e; anything else is invalid.
PROBLEM: Problem: the average age of a family of 5 members is 20 years. if the age of the youngest member be 10 years then what was the average age of the family at the time of the birth of the youngest member ?
Options: a. 13.5, b. 14, c. 15, d. 12.5, e. none

SOLUTION: d

PROBLEM: Problem: 108 a 108 + 92 a 92 = ?
Options: a. 20120, b. 11500, c. 20128, d. 20660, e. 20228

SOLUTION: c

PROBLEM: Problem: chris age after 9 years will be 5 times his age 5 years back. what is the present age of chris ?
Options: a. a. 20, b. b. 25, c. c. 15, d. d. 22, e. e. 16

SOLUTION:
e