DRDO Multi tasking staff Model paper 1

A and B can do piece of work in 40 days and 24 days respectively.
∴ Part of work A can do in a day =1∕40
∴ Part of work B can do in a day =1∕24
Part of work done by A in 8 days =8∕40=1∕5
∴ Remaining part of work =1−‌

1

5

=‌

4

5

∴ Number of days B has to work alone to complete the work =( Remaining part of work )∕( Part of work B can do in a day)
=‌

‌ 4 5

1 24

days
=‌

4

5

×24 days
=‌

96

5

days =19‌

1

5

days