By working together, A and B can finish a work in
15 days. If B alone can finish the work in 20 days,
in how many days can A alone finish the work?
15 days. If B alone can finish the work in 20 days,
in how many days can A alone finish the work?
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A and B → 15 days
A → 20days
So, let's take LCM of 15 and 20. That's 60.
Remember: This 60 unit is the total work to be done.
So, A and B do (60/15) = 4 unit work/day …(1)
And, B does (60/20) = 3 unit work/day …(2)
(1)-(2) gives
A does (4–3)= 1 unit/day
So, Total days req. = (Total work)/unit per day
i.e, A can do it in (60/1)=60 days