IBPS SO Prelims Exam Model Paper 7

Given:
A = 50% more efficient than B
C =

1

2

of work done by A and B together
C alone can do the work in = 40 days
Calculation:
(A’s one day’s work) : (B’s one day’s work)
⇒ 150 : 100
⇒ 3 : 2
Let A’s one day’s work be 3x and B’s one day’s work be 2x.
∴ According to the question
C’s one day’s work =

(3x+2x)

2

⇒

5x

2

=

1

40

⇒ x = (

1

40

) ×

2

5

⇒ x =

1

100

A’s one day’s work be 3/100 and B’s one day’s work be

1

50

.
∴ (A + B + C)’s one day’s work:
⇒

3

100

+

1

50

+

1

40

⇒

15

200

⇒

3

40

= (A + B + C)'s one day work
A, B, C can complete the whole work in

40

3

days.
∴ A, B, and C can complete the work in

40

3

days.