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.

Question: A contractor undertakes to built a walls in 50 days. He employs 40 peoples for the same. However after 25 days he finds that only 40% of the work is complete. How many more man need to be employed to complete the work in time?

Option A: 60

Option B: 30

Option C: 35

Option D: 20

Option E: None of these
Option A

Question: How many zeroes are there at the end of the number N, if N = 150! + 300! ?

Option A: 28

Option B: 31

Option C: 34

Option D: 37

Option E: 40
Option D

Question: Including Cara and Dan, there are seven members on the board of directors for a company. If the board is to be split up into a five-person subcommittee, what fraction of all the possible subcommittees that include Cara, also include Dan?

Option A: 3/5

Option B: 5/6

Option C: 4/5

Option D: 3/4

Option E: 2/3
Option E