SSC CGL 17 Aug 2021 Shift 3 Paper

Question : 52 of 100

Marks: +1, -0

Each one of the five men independently can complete a work in 20 days. The work is started by one person. Next day one more person joins the work and every next day one more person joins. From the fifth day, five persons continued working as a team. In how many days, will the work be completed?

Validate

Solution:

According to the question,
Let efficiency of each person is

1 .

Total work

=20

unit
On first day 1 unit done,
2 nd day

=2

unit,
3rd day

=3

unit,
4th day

=4

unit,
5th day

=5

unit
Total work completed

\;\; =1+2+3+4+5

\;\; =15 \;\text " unit "\;

Remaining work to complete

=20-15=5 \;\text " unit "\;

After that next day all 5 person jointly work 5 unit.
So, total 6 days will required to complete a work.

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