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: if the average ( arithmetic mean ) of a and b is 45 and the average of b and c is 80, what is the value of c − a ?
Options: a. 25, b. 60, c. 90, d. 140, e. it can not be determined from the information given.
[EX A]: b

[EX Q]: Problem: a no. when divided by 281 gives a remainder 160, what remainder will be obtainedby dividingthe same no. 21 ?
Options: a. 21, b. 22, c. 23, d. 24, e. 25
[EX A]: a

[EX Q]: Problem: water boils at 212 ° f or 100 ° c and ice melts at 32 ° f or 0 ° c. if the temperature of a pot of water is 55 ° c, what is the temperature of the pot of water in ° f ?
Options: a. 116 ° f, b. 125 ° f, c. 131 ° f, d. 138 ° f, e. 145 ° f
[EX A]:
c