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A stationery shop orders a batch of pens from a factory. The factory could make the batch of pens in 20 days using 12 machines.

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A stationery shop orders a batch of pens from a factory. The factory could make the batch of pens in 20 days using 12 machines. Due to a fault, only 3 machines were used for the first 8 days. All 12 machines were used from day 9 onwards. Work out the total number of days taken to make the batch of pens

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