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.

[EX Q]: Question: In an electric circuit, two resistors with resistances x and y are connected in parallel. If R is the combined resistance of these two resistors, then the reciprocal of R is equal to the sum of the reciprocals of x and y. What is R if x is 5 Ohms and y is 7 Ohms?

 Option A: 3/5

 Option B: 1/7

 Option C: 12/35

 Option D: 31/12

 Option E: 35/12
[EX A]: Option E

[EX Q]: Question: We have boxes colored either red or blue. In each blue box there is a fixed number of blueberries. In each red box there is a fixed number of strawberries. If we dispose of one blue box for one additional red box, the total number of berries would increase by 12, and the difference between the total number of strawberries and the total number of blueberries would increase by 76. Each blue box contains how many blueberries?

 Option A: 26

 Option B: 28

 Option C: 30

 Option D: 32

 Option E: 34
[EX A]: Option D

[EX Q]: Question: Length and Breadth of a rectangle is 7 m and 3.5 m respectively. Find the area of circle of maximum radius

 Option A: 9.625

 Option B: 9.74

 Option C: 9.8

 Option D: 9.725

 Option E: 9.547
[EX A]:
Option A