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: The average weight of 10 person's increases by 4 kg when a new person comes in place of one of them weighing 70kg. What is the weight of the new person?

Option A: 85

Option B: 86.5

Option C: 90

Option D: 88.5

Option E: 110

SOLUTION: Option E

PROBLEM: Question: Which of the following is greatest?

Option A: 1/10

Option B: 1/100

Option C: 1/1000

Option D: 1/10^9

Option E: 1/5

SOLUTION: Option E

PROBLEM: Question: Bill has d animals, 28 of which were sold at a profit of 10% each while the rest were sold at a loss of 20% each. Overall, Bill made neither a profit nor a loss. Which of the following is equal to d?

Option A: 6

Option B: 12

Option C: 18

Option D: 24

Option E: 42

SOLUTION:
Option E