Homework answers / question archive / A stationery shop orders a batch of pens from a factory

A stationery shop orders a batch of pens from a factory

Math

Share With

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.