Question

A can do a work in 15 days and B in 20 days. If they work on it together for 4 days then find the fraction of the work that is left.​

Answer 1

Answer:

-5=4

Step-by-step explanation:

A-B=4

15-20=4

-5=4

Answer 2

Answer:

let total work is = 1.

• A do 1/15 work in one day.
• B do 1/20 work in one day.

As given in question A and B work togather for 4 day.

A and B do work togather in one day is

$\frac{1}{15} + \frac{1}{20} = \frac{7}{60}$

The work A and B do togather for 4 day is.

$4 \times \frac{7}{60} = \frac{7}{15}$

7/15 amount work is completed in 4 days.

The amount of left work is

$1 - \frac{7}{15} = \frac{8}{15}$

so, 53.333% work is left.