SBI PO 2018 Papers

A's 1 day's work =

1

27

⇒ A's 12 days work =

1

27

×12=

4

9

Remaining work = 1−

4

9

=

5

9

Similarly, B's 11 days work =

1

33

×11=

1

3

Remaining work =

5

9

−

1

3

=

2

9

Now, days taken by C to complete the work = 45 days
⇒ Days taken to complete

2

9

th of the work =

2

9

×45=10 days
∴ Days in which the whole work is completed = 12 + 11 + 10 = 33 days