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Let total amount of work be 28 units
Efficiency of (A + B) = 28/14 = 2 units/day
Efficiency of ‘B’ = 28/28 = 1 unit/day
Amount of work done by ‘B’ = 21 × 1 = 21 units
Percentage of work done by ‘A’ = {(28 – 21)/28} × 100 = 25%
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