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: what number must be added to 6, 16 and 8 to get an average of 13 ?
Options: a. 23, b. 22, c. 44, d. 33, e. 55
b

Problem: there are 15 boys and 10 girls in a class. if three students are selected at random, in how many ways that 1 girl or 2 boys are selected ?
Options: a. 100, b. 105, c. 115, d. 120, e. 125
c

Problem: if there are 86 workers in a factory, and on a certain day, 72 were present. calculate the percentage that showed up for work ? ( round to the nearest tenth ).
Options: a. 82.7 %, b. 81.7 %, c. 83.7 %, d. 89.7 %, e. 88.7 %

c