Task: Question Answering
Input (English): Problem: 3 positive integers a, b, and c are such that their average is 20 and a ≤ b ≤ c. if the median is ( a + 13 ), what is the least possible value of c ?
Options: a. 21, b. 22, c. 23, d. 24, e. 25
Output (English): e