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: if 20 typists can type 50 letters in 30 minutes, then how many letters will 40 typists working at the same rate complete in 1 hour ?
Options: a. 400, b. 500, c. 350, d. 250, e. 200
answer:
a


question:
Problem: what is the value of ( 2 ) ^ - 3 ?
Options: a. 1 / 6, b. 1 / 5, c. 1 / 8, d. 1 / 9, e. 1 / 7
answer:
c


question:
Problem: a man sells a car to his friend at 10 % loss. if the friend sells it for rs. 54000 and gains 20 %, the original c. p. of the car was :
Options: a. rs. 25000, b. rs. 37500, c. rs. 50000, d. rs. 60000, e. none of these
answer:

c