21. A and B together can finish a piece of work in 12 days. If 'A' alone can finish the same work 20days, in how many days B alone can finish it?
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Step-by-step explanation:
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The Number of days will be 30 days.
Step-by-step explanation:
Let the number of days taken by B to complete the work be x days.
A finishes the work in 20 days.
No. of days A and B worked together= 12
1/20+1/x=1/12
1/x=1/12-1/20
1/x=5/60-3/60
1/x= 2/30 or 1/30
x=30
Therefore, B completes the work in 30 days.
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