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: Little John had $8.50. He spent $1.25 on sweets and gave to his two friends $1.20 and $2.20. How much money was left?

 Option A: $5.85

 Option B: $6.85

 Option C: $ 3.85

 Option D: $2.85

 Option E: $4.85

Answer: Option C


Question: Question: A man performs 3/5 of the total journey by rail, 17/20 by bus and the remaining 6.5 km on foot. His total journey is :

 Option A: 125 km

 Option B: 130 km

 Option C: 135 km

 Option D: 140 km

 Option E: None

Answer: Option B


Question: Question: A chemical supply company has 60 liters of a 20% HNO3 solution. How many liters of pure undiluted HNO3 must the chemists add so that the resultant solution is a 50% solution?

 Option A: 12

 Option B: 15

 Option C: 20

 Option D: 24

 Option E: 36

Answer:
Option E