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 average expenditure of a labourer for 6 months was 90 and he fell into debt. In the next 4 months by reducing his monthly expenses to 60 he not only cleared off his debt but also saved 30. His monthly income i

 Option A: 70

 Option B: 72

 Option C: 75

 Option D: 78

 Option E: 81

Answer: Option E


Question: Question: A train 175 m long pass a telegraph pole in 5 seconds. Find the speed of the train

 Option A: 66 km/hr

 Option B: 68.4 km/hr

 Option C: 72 km/hr

 Option D: 126 km/hr

 Option E: None

Answer: Option D


Question: Question: Solution Y is 30 percent liquid J and 70 percent water. If 2 kilograms of water evaporate from 8 kilograms of solutions Y and 2 kilograms of solution Y are added to the remaining 6 kilograms of liquid, what percent of this new liquid solution is liquid J?

 Option A: 30%

 Option B: 33 1/3%

 Option C: 37 1/2%

 Option D: 40%

 Option E: 50%

Answer:
Option C