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: 3 ltr of water is added with 9 ltr of a solution containing 57 % of alcohol in the water. the % of alcohol in the new mixture is ?
Options: a. 41.5 %, b. 42.75 %, c. 43 %, d. 45 %, e. 45.75 %

SOLUTION: b

PROBLEM: Problem: the present worth of rs. 2310 due years hence, the rate of interest being 15 % per annum, is :
Options: a. rs. 1440, b. rs. 1750, c. rs. 1680, d. rs. 1840, e. none of these

SOLUTION: c

PROBLEM: Problem: a fruit seller sells mangoes at the rate of rs. 12 per kg and thereby loses 10 %. at what price per kg, he should have sold them to make a profit of 15 % ?
Options: a. rs. 11.81, b. rs. 12, c. rs. 15.33, d. rs. 12.31, e. none

SOLUTION:
c