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.

[EX Q]: 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
[EX A]: Option B

[EX Q]: Question: 8 persons can build a wall 140m long in 42 days. In how many days can 30 persons complete a similar wall 100 m long?

 Option A: 12

 Option B: 10

 Option C: 8

 Option D: 6

 Option E: 5
[EX A]: Option C

[EX Q]: Question: Find the amount on Rs.7000 in 2 years, the rate of interest being 4% per first year and 5% for the second year?

 Option A: 5568

 Option B: 6369

 Option C: 5460

 Option D: 7644

 Option E: 6734
[EX A]:
Option D

