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: A boat can travel with a speed of 25km/hr in still water. If the speed of the stream is 5km/hr, find the time taken by the boat to go 120km downstream.

 Option A: 1 hr

 Option B: 2 hrs

 Option C: 3 hrs

 Option D: 4 hrs

 Option E: 5 hrs

SOLUTION: Option D

PROBLEM: Question: The average marks obtained by 120 cndidates in a certainexaminationis 35.if the average marks of passed candidate is 39 and that ofthe failed candidates is 15,what is the no. of candidates who passed the examination

 Option A: 14 years

 Option B: 14 years 3 month

 Option C: 14 years 8 month

 Option D: 15 years 8 month

 Option E: 16 years 2 month

SOLUTION: Option C

PROBLEM: Question: If d is a positive integer greater than 1, what is the sum of the multiples of d from d to d^2, inclusive?

 Option A:  d(d + 1

 Option B:  d^2(d + 1

 Option C:  d^2(d-1

 Option D:  (x^3 + 2x

 Option E:  x(x-1

SOLUTION:
Option B