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1. x can do a piece of work in 20 days and Y can do the 1/7th of the same work in 5 days. In how many days together they can complete the 11/14th of the total work?
- A. 15 days
- B. 15 days
- C. 15 days
- D. 15 days
Answer: Option C
Explanation:
y can do in 1 day = 1/(7x5) = 1/35
x & y can do in 1 day = 1/20 + 1/35 = 11/140
Now,
11/140 work is done in 1 day
So, 1 work is done in 140/11 day
So, 11/14 work is done in (140x11)/(11x14) = 10 days.
x & y can do in 1 day = 1/20 + 1/35 = 11/140
Now,
11/140 work is done in 1 day
So, 1 work is done in 140/11 day
So, 11/14 work is done in (140x11)/(11x14) = 10 days.
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