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.
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Question: Question: The compound ratio of 1:3, 3:2 and 4:5?

 Option A: 1:9

 Option B: 1:7

 Option C: 1:2

 Option D: 2:5

 Option E: 1:4

Answer: Option D


Question: Question: A and B rent a pasture for 10 months. A put in 80 cows for 7 months. How many can B put in for the remaining 3 months, if he pays half as much again as A?

 Option A: 388

 Option B: 277

 Option C: 266

 Option D: 280

 Option E: 191

Answer: Option D


Question: Question: The average of 10 numbers was calculated as 20. It is discovered later on that while calculating the average, one number, namely 86, was incorrectly read as 26. What is the correct average?

 Option A: 22

 Option B: 23

 Option C: 24

 Option D: 25

 Option E: 26

Answer:
Option E