If 10 men or 15 women can complete a work in 170 days, how long will 20 men and 20 women take for completing the same work?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 51 days.
1 man’s 1 day work = 1/(10 × 170) = 1/1700
1 woman’s 1 day work = 1/(15 × 170) = 1/2550
20 men + 20 women’s 1 day work = 20/1700 + 20/2550
= 1/85 + 2/255
= 1/51
Time required = 51 days