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: A shopkeeper sold an book offering a discount of 5% and earned a profit of 30%. What would have been the percentage of profit earned if no discount was offered?

Option A: 140

Option B: 120

Option C: 130

Option D: 136.8

Option E: 150

SOLUTION: Option D

PROBLEM: Question: If x, y, and z are negative integers and 3x - 3y = -3z, then which of the following statements must be true?
I. x > y
II. x > y > z
III. x = z

Option A: I and II

Option B: I only

Option C: II only

Option D: III only

Option E: None

SOLUTION: Option B

PROBLEM: Question: Two pipes can fill a tank in 18 minutes and 15 minutes. An outlet pipe can empty the tank in 45 minutes. If all the pipes are opened when the tank is empty, then how many minutes will it take to fill the tank?

Option A: 10 minutes

Option B: 20 minutes

Option C: 15 minutes

Option D: 12 minutes

Option E: 18 minutes

SOLUTION:
Option A