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.

Example Input: Question: Find compound interest on Rs. 5000 at 12% per annum for 1 year, compounded half-yearly.

Option A: Rs. 600

Option B: Rs. 618

Option C: Rs. 525

Option D: Rs. 620

Option E: None
Example Output: Option B

Example Input: Question: Read the following three equations:
5 ~ 4 ~ 3 ~ 9 = 4215
6 ~ 9 ~ 2 ~ 6 = 3816
4 ~ 7 ~ 3 ~ 3 = 1122
Now based on the rule that has been used, solve the following equation:
4 ~ 2 ~ 7 ~ 4 = ____

Option A: 1416

Option B: 2910

Option C: 2940

Option D: 3749

Option E: 4470
Example Output: Option A

Example Input: Question: The ratio of the present age of Sandy to that of Molly is 7:2. Sixteen years from now, the ratio of the ages of Sandy to Molly will be 5:2. What was Sandy's age 6 years ago?

Option A: 66

Option B: 70

Option C: 74

Option D: 78

Option E: 82
Example Output:
Option D