IBPS RRB Officer Prelims 16 Sep 2017 Paper

(4) 8 men can do 1 work in 25 days.
15 women can do the same work in 16 days.
∴(8×25) men ≡ (15×16) women
∴ 5 men ≡ 6 women
∴ 4 men + 8 women
≡ [4+

5

6

×8]men
≡[4+

20

3

]men
≡

32

3

men
∵

M1D1

W+1

=

M2D2

W2

⇒

8×25

1

=

32 3

W2

×10
⇒W2=

32×10

3×8×25

=

8

15

Remaining work 1−

8

15

=

7

15

Again, 6 men join the team.
∴ Number of men =

32

3

+6=

50

3

∴

M1D1

W1

=

M2D2

W2

⇒

8×25

1

=

50 3×D2 7

15

⇒8×25=

50

3

×

15

7

×D2
⇒D2=

8×25×7

50×5

=

28

5

=5

3

5

days