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: cost is expressed by the formula tb ^ 4. if b is doubled, the new cost w is what percent of the original cost ?
Options: a. w = 200, b. w = 600, c. w = 800, d. w = 1600, e. w = 50

SOLUTION: d

PROBLEM: Problem: a, b and c start a business each investing 20,000. after 6 months a withdrew 5000, b withdrew 4000 and c invests 6000 more. at the end of the year, a total profit of 67,600 was recorded. find the share of b.
Options: a. 20,000, b. 21,200, c. 21,600, d. 20,500, e. none of these

SOLUTION:
c