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 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
answer:
Option A

question:
Question: A certain sum earns simple interest of Rs. 800 in 2 years at a certain rate of interest. If the same sum earns compound interest of Rs.900in the same period of 2 years, What must be the rate of interest?

Option A: 25%

Option B: 10%

Option C: 15%

Option D: 20%

Option E: 30%
answer:
Option A

question:
Question: In May, the grounds keeper at Spring Lake Golf Club built a circular green with an area of 81 square feet. In August, he doubled the distance from the center of the green to the edge of the green. What is the total area of the renovated green?

Option A: 100PI

Option B: 144PI

Option C: 196PI

Option D: 256PI

Option E: 324PI
answer:
Option E