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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 8 machines were used for the first 9 days. All 12 machines were used from day 10 onwards. Work out the total number of days taken to make the batch of pens.

This problem explores rate of work calculations for a factory producing a batch of pens. Only 8 out of 12 machines were operational initially due to a fault, affecting the completion time. Learn how to calculate the total days required using algebraic work rate concepts, ideal for high school students in Grades 10-12.

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