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: the h. c. f. of two numbers is 30 and the other two factors of their l. c. m. are 15 and 12. the larger of the two numbers is
Options: a. 476, b. 399, c. 450, d. 322, e. none
answer:
c


question:
Problem: if x > 3000, then the value of ( 1.2 x ) / ( 0.5 x - 406 ) is closest to ?
Options: a. 1 / 6, b. 1 / 3, c. 10 / 21, d. 1 / 2, e. 3 / 1
answer:

e