CDS Model Paper 1 Mathematics

Work done by (A+B) in 1 day =

1

12

Work done by (B+C) in 1 day =

1

16

Let C finishes the work in x days.
Then, work done by C in 1 day =

1

x

We have, A's 5 days' work + B's 7days' work + C's 13 days' work =1
or [(A+B) 's 5 days' +(B+C)′s2 days' +C 's 11 days' ]work =1
or

5

12

+

2

16

+

11

x

=1 or x=24 days