A can do a work in 20 days and B in 10 days. If they work on it together for 5 days, then what fraction of work is left.
A) 4/9 B) 1/4 C) 1/5 D) 2/9
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A can do a work in 15 days and B in 20 days. If they work together for 4 days then what is the fraction of work that is left?
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Let's tKe total work as LCM of 15 and 20,
Total work = 60 units
A finishes work in 15 days, therefore does 60/15 = 4 units in a day
B finishes work in 20 days, therefore does 60/20 = 3 units in a day
In a single day working together they finish = 4+3 = 7 units
Working together for 4 days, they will finish = 4*7 = 28 units
Part of work finished so far is = 28/total work = 28/60 = 7/15
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