AP ICET 2019 Shift 1 Paper

Question : 100 of 200

Marks: +1, -0

P alone can do a work in 15 days and Q alone can do it in 20 days. With the help of R they finish the work in 5 days. How many days R alone will take to finish the work?

Validate

Solution:

Let the number of days to complete the work by R be K.
Given,
The part of the work done in one day

=1/5

⇒{1}/{15}+{1}/{20}+{1}/{K}={1}/{5} ⇒ K=12

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