Explain properly this question please
In this question they are saying,
There were 3 people,There names are A,B and C.then they are saying that A can finish his job in 12 days,B can finish in 15 days and C can on 20 days.A,B and C WORKED TOGETHER FOR 2 days to finish all of their job but C left . so they are asking how much time or days would A and B take to complete their all work
Solution:
Work is done by A in one day =151
By B=121
C=201
Together in 1 Day =151+121+201=604+5+3=6012=51
2 days work = 52
Remaining work = 1−52=53
one day work of A,B ⇒A+B=151+121=604+5=609=203
(A+B) work for t days = 203t=53
t=4 days
A and B will complete the work in 4 days.