Time and Work Practice Test 1 with solutions

Work done by 90 workers in 1 day =

1

360

Work done by 90 workers in 90 days
= 90×

1

360

=

1

4

Remaining work 1 -

1

4

=

3

4

90 more workers have joined, so total workers = 180
If 90 workers finish work in 360 days, then 180 workers finish the work in 180 days
So,

3

4

th part of work is done by 180 workers in
180×

3

4

= 135 days.
Time taken to complete the work = 90 + 135 = 225
Number of days saved = 360 - 225 = 135 days.