AFCAT II 2020 Solved Paper

let total work =600 units (LCM of 200 , 300 )
A does per day =

600

200

=3 units
B does per day

600

300

=2 units
Both A and B together work per day =5 units
Let both A and B together work for x days and remaining done by A in 100days
So, 5units×x‌days+3‌units×100‌days=600
5x+300=600
⇒x=60 days
Where x is number of days B work with A