A and B can complete 1/15th portion of total work per day.
B alonly can complete 1/20th portion of total work per day.
So we have to look for portion of work completed by A per day
(1/15)-(1/20)= 1/60
So we can say that A can take 60days to completed work
(A+B)=15 days & B= 20days Total work (LCM of 15,20) =60 units (A+B) one day's work = 60/15=4 unitS B one day's work = 60/20=3 unit A's work = 4-3 =1 Hence A alone complete the work = 60/1 =60 days ANS:60 days
A,B=15 days
B= 20days
Total work (LCM of 15,20) =60 units
A,B one day's work = 60/15=4 unit
B one day's work = 60/20=3 unit
A's work = 4-3 =1
A alone complete the work = 60/1 =60 days
1 Day work of A+B is 1/15 1 Day work of B is 1/20 1 Day work of A will be 1/15-1/20=1/60 so 1/60th part of the work done by A in 1 Day 1 work is done by A is 60*1=60 Days.