TASK DEFINITION: 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: Problem: in what time will a railway train 50 m long moving at the rate of 36 kmph pass a telegraph post on its way ?
Options: a. 5 sec, b. 4 sec, c. 3 sec, d. 6 sec, e. 1 sec

SOLUTION: a

PROBLEM: Problem: the perimeter of a triangle is 40 cm and the inradius of the triangle is 2.5 cm. what is the area of the triangle ?
Options: a. 87 cm 2, b. 28 cm 2, c. 98 cm 2, d. 26 cm 2, e. 50 cm 2

SOLUTION: e

PROBLEM: Problem: the cost of registration at a professional association meeting was $ 50 per person; a lunch for registrants only was available for an additional $ 22 per person. if the number of registrants who paid for lunch was 10 more than the number who did not, and if receipts for registration and lunch totaled $ 61720, how many people paid just for registration at the meeting ?
Options: a. 700, b. 800, c. 1,300, d. 500, e. 1,800

SOLUTION:
d