RRB RPF RPSF SI and CONS Model Papers 3 with solutions

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Question : 32 of 120

Marks: +1, -0

If 10 men or 20 women or 40 children can do a piece of work in 7 months, then 5 men, 5 women and 5 children together can do half of the work in:

8 months
6 months
4 months
5 months

Solution:

(c) 10 men = 20 women = 40 children
i.e. 1m = 2w = 4 m

∴ { S } _ { { m } } + { S } _ { { W } } + { S } _ { { ch } }

⇒

5 × 4 + 5 × 2 + 5 = 35

{ { M } _ { 1 } { D } _ { 1 } } /{ { W } _ { 1 } } = { { M } _ { 2 } { D } _ { 8 } }/ { { W } _ { 2 } }

{ 40× 7 }/ { 1 } = { 35 × { D } _ { 2 } }/ { { 1 }/ { 2 } }

{ 40 × 7 }/ { 35× 2 } = { D } _ { 2 }

{ D } _ { 2 } = 4

months.

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