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: Bat is bought for Rs.400 and sold at a gain of 20% find its selling price?

 Option A: Rs.320

 Option B: Rs.350

 Option C: Rs.370

 Option D: Rs.480

 Option E: None of these
answer:
Option D


question:
Question: Running at the same constant rate, 8 identical machines can produce a total of 240 pens per minute. At this rate, how many pens could 5 such machines produce in 5 minutes?

 Option A:  114

 Option B:  108

 Option C:  192

 Option D:  750

 Option E:  777
answer:
Option D


question:
Question: Three numbers are in the ratio 1 : 2 : 3 and their H.C.F is 2. The numbers are

 Option A: 12, 24, 30

 Option B: 12, 24, 38

 Option C: 12, 24, 362

 Option D: 2, 4, 6

 Option E: 12, 24, 321
answer:

Option D