TASK DEFINITION: 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.
PROBLEM: Question: If the operation is defined by a b = (b - a)^2/a^2 for all numbers a and b, and a = 0, then what is the result when we evaluate this expression: (-5) (5 5) ?

Option A: 49/9

Option B: 49/16

Option C: 81/16

Option D: 81/25

Option E: 100/81

SOLUTION: Option D

PROBLEM: Question: The average marks of a class of 35 students is 45 and that of another class of 55 students is 65. Find the average marks of all the students?

Option A: 52.6

Option B: 52.4

Option C: 52.1

Option D: 57

Option E: 52.9

SOLUTION: Option D

PROBLEM: Question: In a group of 250 readers who read science fiction or literacy works or both, 180 read science fiction and 88 read literacy works. How many read both science fiction and literacy works?

Option A: 268

Option B: 180

Option C: 150

Option D: 18

Option E: 88

SOLUTION:
Option D