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.

[EX Q]: Problem: the average age of 8 men increases by 2 years when two women are included in place of two men of ages 20 and 22 years. find the average age of the women ?
Options: a. 87, b. 98, c. 30, d. 29, e. 37
[EX A]: d

[EX Q]: Problem: an industrial loom weaves 0.128 metres of cloth every second. approximately, how many seconds will it take for the loom to weave 25 metre of cloth ?
Options: a. 194 seconds, b. 195 seconds, c. 196 seconds, d. 197 seconds, e. none of these
[EX A]: b

[EX Q]: Problem: the average age of students of a class is 15.8 years. the average age of boys in the class is 16.4 years and that of the girls is 15.7 years. the ration of the number of boys to the number of girls in the class is ?
Options: a. 1: 6, b. 2: 3, c. 2: 5, d. 2: 1, e. 2: 4
[EX A]:
a