Question
‘A’ and ‘B’ can do a piece of work in 20 days
and 25 days, respectively. They started working together but ‘A’ left after 4 days. Find the time taken by ‘B’ to complete the remaining work.Solution
Let total amount of work be 100 units (LCM of 20 and 25). Efficiency of ‘A’ = 100/20 = 5 units/day Efficiency of ‘B’ = 100/25 = 4 units/day Amount of work done by ‘A’ and ‘B’ together in 4 days = (5 + 4) × 4 = 36 units Time taken by B to complete remaining work = {(100 – 36)/4} = 16 days
Rice crop is transplanted at spacing of 20 cm ×10cm by using 2 seedlings per hill. Calculate the plant population in 2000m2 area.
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