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.

Q: Problem: ages of two persons differ by 20 years. if 6 year ago, the elder one be 3 times as old the younger one, find their present age
Options: a. 12,28, b. 14,30, c. 16,36, d. 18,34, e. 19,34

A: c
****
Q: Problem: 2.205 divided by 0.3 gives
Options: a. 7.35, b. 6.25, c. 8.15, d. 6.95, e. none of these

A: a
****
Q: Problem: a fill pipe can fill 1 / 4 of cistern in 16 minutes. in how many minutes, it can fill 3 / 4 of the cistern ?
Options: a. 24 min, b. 30 min, c. 48 min, d. 26 min, e. 16 min

A:
c
****
