TASK DEFINITION: You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.
PROBLEM: Question: In a class of 40 students, 10 did not opt for math. 15 did not opt for science and 2 did not opt for either. How many students of the class opted for both math and science?

 Option A: 13

 Option B: 15

 Option C: 7

 Option D: 17

 Option E: 18

SOLUTION: Option C

PROBLEM: Question: A box contains 9 pairs of shoes (18 shoes in total). If two shoes are selected at random, what it is the probability that they are matching shoes?

 Option A: 1/190

 Option B: 1/17

 Option C: 1/19

 Option D: 1/10

 Option E: 1/9

SOLUTION: Option B

PROBLEM: Question: Mohit sold an article for Rs. 18000. Had he offered a discount of 25% on the selling price, he would have earned a profit of 8%. What is the cost price of the article?

 Option A: 12500

 Option B: 27767

 Option C: 16688

 Option D: 26678

 Option E: 19987

SOLUTION:
Option A