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: the cross - section of a cannel is a trapezium in shape. if the cannel is 12 m wide at the top and 2 m wide at the bottom and the area of cross - section is 4200 sq m, the depth of cannel is ?
Options: a. 500, b. 600, c. 700, d. 800, e. 900
answer:
b


question:
Problem: how many integers are between 6 and 74 / 5, inclusive ?
Options: a. 4, b. 5, c. 6, d. 7, e. 9
answer:
e


question:
Problem: if 45 - [ 28 - { 37 - ( 15 - * ) } ] = 54, then * is equal to :
Options: a. - 29, b. - 19, c. 15, d. 29, e. 39
answer:

c