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: There are 36 students in a certain geometry class. If one third of the students are boys and one fourth of the boys are under six feet tall, how many boys in the class are under six feet tall?

 Option A: 3

 Option B: 12

 Option C: 18

 Option D: 24

 Option E: 27

Answer: Option A


Question: Question: The sector of a circle has radius of 42 cm and central angle 135o. Find its perimeter?

 Option A: 91.5 cm

 Option B: 92.2 cm

 Option C: 28.9 cm

 Option D: 29.2 cm

 Option E: 183 cm

Answer: Option E


Question: Question: A sum of money becomes triple itself in 5 years at simple interest. How many years will it become nine times at the same rate?

 Option A: 12 Â½ years

 Option B: 62 Â½ years

 Option C: 18 Â½ years

 Option D: 72 Â½ years

 Option E: 12 Â½ years

Answer:
Option C