My math teacher could not do it
#Help me this is impossible
languid acorn
analog sluice
20 days for 12 machines -> 240 days for 1 machine
8 days of 9 machines -> 72 days for 1 machine
so we have 240 - 72 = 168 days of work for 1 machine left
168/12 = 14 days, adding that to initial 8 yields 22
thick ocean
My math teacher could not do it
Get a new math teacher would be the main takeaway in this case