Question

Don can complete 4 jobs in 3 days. Lily can complete 5 jobs in 2 days. Working together how long will it take them to complete 25 jobs?

Answer 1

approximately 7 days.

Explanation:

Don takes time to complete 4 jobs = 3 days

he completed his job in 1 day =
`(4)/(3)`

Lily takes time to complete 5 jobs = 2 days

Lily completed her job in 1 day =
`(5)/(2)`

Working together they can complete the job in 1 day

=
`(4)/(3)+ (5)/(2)`

=
`(8+15)/(6)`

=
`(23)/(6)`

Working together it will take time to complete 25 jobs

= 25 ÷
`(23)/(6)`

=
`25* (6)/(23)`

=
`(150)/(23)`

=
`6(12)/(23)` days

= 6.52 ≈ 7 days

It will take 6.52 or approximately 7 days to complete 25 jobs together.