Question

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

Answer 1

Answer:

this is the answer may it helps you

Answer 2

Answer:

17/15

Step-by-step explanation:

A can do work in 15 days = 1

A can do work in 1 day = 1/15

B can do work in 20 days = 1

B can do work in 1 day = 1/20

they both can do work in 1 day = 1/15+1/20

                                                    =(4+3)/60

                                                     =7/60

the both complete work in 4 days = 7/60*4

                                                         = 7/15