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: The probability that a visitor at the mall buys a pack of candy is 30%. If three visitors come to the mall today, what is the probability that exactly two will buy a pack of candy?

 Option A: 343

 Option B: 147

 Option C: 189

 Option D: 063

 Option E: 027
answer:
Option C


question:
Question: The average weight of 5 person's increases by 10 kg when a new person comes in place of one of them weighing 40 kg. What might be the weight of the new person?

 Option A: 76 kg

 Option B: 76.5 kg

 Option C: 90 kg

 Option D: Data inadequate

 Option E: None of these
answer:

Option C