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Total weight of 8 boxes = 8 × 45 = 360 kg Total weight of 9 boxes = 360 + 63 = 423 kg New average = 423 ÷ 9 = 47 kg Correct Option: a
Naina and Kalpana working together can do a piece of work in 10 days, whereas Naina alone can do it in 12 days. In how many days can Kalpana do it alone?