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: 10 3/4 + 7 2/17 - 9 1/15=?

 Option A: 7 719/1020

 Option B: 9 817/1020

 Option C: 9 719/1020

 Option D: 8 817/1020

 Option E: None of them

SOLUTION: Option D

PROBLEM: Question: The 120 students in a group are to be seated in rows so that there is an equal number of students in each row. Each of the following could be the number of rows EXCEPT

 Option A:  4

 Option B:  20

 Option C:  30

 Option D:  40

 Option E:  90

SOLUTION: Option E

PROBLEM: Question: The present ages of three persons in proportions 10 : 1 : 5. Eight years ago, the sum of their ages was 56. Find their present ages (in years).

 Option A: 50, 5, 25

 Option B: 16, 28, 36

 Option C: 16, 28, 35

 Option D: 16, 28, 34

 Option E: 16, 28, 33

SOLUTION:
Option A