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.

Q: Question: Sum of 19 odd numbers is?

 Option A: 341

 Option B: 351

 Option C: 361

 Option D: 371

 Option E: 381

A: Option C
****
Q: Question: Two out of five employees are capable of doing a certain task. Sixty percent of the five employees, including the two who are capable, are assigned to a project involving this task. what percentage of employees assigned to the project are not capable?

 Option A: 43.33%

 Option B: 33.33%

 Option C: 13.33%

 Option D: 38.33%

 Option E: 23.33%

A: Option B
****
Q: Question: A man rows his boat 85 km downstream and 45 km upstream, taking 2 1/2 hours each time. Find the speed of the stream?

 Option A: 2 kmph.

 Option B: 4 kmph.

 Option C: 5 kmph.

 Option D: 8 kmph.

 Option E: 7 kmph.

A:
Option D
****