Question

Adam can do a job in 15 days, John can do the same job in 20 days. If they work
together for 4 days on this job. What fraction of job is incomplete ?
A. 1/4
B.7/15
C.1/10
D.8/15
E. None of these​

Answer 1

Answer:

Take LCM of 15 and 20 as the total amount of work which is 60 units in this case.

A can do work in 15 days therefore amount of work done by A in 1 day is 60/15 = 4 units

B can do work in 15 days therefore amount of work done by A in 1 day is 60/20 = 3 units

Total amount of work done in 1 day =A work of 1 day+B's work of 1 day=4 units +3 units=7 units

Amount of work done in 4 days =4*7=28 units

Amount of Work Left = 60–28=32 units

Fraction of work left = Amount of work left/ Total Work = 32/60 = 8/15.

Step-by-step explanation:

plzz like