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: a sum of money at simple interest amounts to $ 645 in 3 years and to $ 690 in 4 years. the sum is :
Options: a. $ 153, b. $ 510, c. $ 598, d. $ 549, e. $ 675

SOLUTION: b

PROBLEM: Problem: a 16 % stock yielding 10 % is quoted at :
Options: a. 83.33, b. 110, c. 112, d. 120, e. 160

SOLUTION: e

PROBLEM: Problem: a train running at the speed of 60 km / hr crosses a pole in 15 sec. what is the length of the train ?
Options: a. 287, b. 699, c. 250, d. 168, e. 150

SOLUTION:
c