A completes 80% of a work in 20 days. Then B joins A and they complete the remaining work in 3 days. How long will B alone take to complete the whole work?
Given:
A completes 80% of work in 20 days.
Remaining 20% work completed by A and B together in 3 days.
Formula Used:
Work = Rate × Time.
Solution:
Let the total work be 100 units.
A does 80% of 100 = 80 units in 20 days
Efficiency of A = 4 unit per day
Now remaining work = 20 units
Work done by A in next 3 days = 4 × 3 = 12 units
Remaining work done by B in 3 days, so B’s efficiency =
B alone can complete the whole work in = 100 ÷ = 37.5 days
English
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