instruction:
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:
Question: A committee of 5 people is to be selected from 7 people. How many different committees are possible?

 Option A: 21

 Option B: 40

 Option C: 56

 Option D: D.168

 Option E: 336
answer:
Option A


question:
Question: How much time will it take for an amount of Rs. 900 to yield Rs. 81 as interest at 4.5% per annum of simple interest?

 Option A: 2 years

 Option B: 3 years

 Option C: 1 year

 Option D: 4 years

 Option E: 5 years
answer:
Option A


question:
Question: An article is bought for Rs.675 and sold for Rs.900, find the gain percent?

 Option A: 16 2/3%

 Option B: 30%

 Option C: 33 1/3%

 Option D: 33 1/6%

 Option E: 33 1/9%
answer:

Option C