instruction:
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.
question:
Problem: a can do a job in 15 days and b in 20 days. if they work on it together for 4 days, then the fraction of the work that is left is ?
Options: a. 2 / 15, b. 8 / 15, c. 3 / 11, d. 1 / 12, e. 6 / 13
answer:
b


question:
Problem: the area of a triangle is with base 18 m and height 6 m ?
Options: a. 88 m 2, b. 10 m 2, c. 66 m 2, d. 54 m 2, e. 31 m 2
answer:
d


question:
Problem: the balance of a trader weighs 10 % less than it should. still the trader marks up his goods to get an overall profit of 20 %. what is the mark up on the cost price ?
Options: a. 40 %, b. 8 %, c. 25 %, d. 16.66 %, e. 9 %
answer:

b