Raymond B. answered • 12/03/22
Tutor
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Math, microeconomics or criminal justice
8 do the task in 9 days
how many machines to do it in 12 days? less than 8.
8 in 9 days means each machine does 1/9 of the task per day
in one day 8 machines to do 1/9 , each machine does 1/72 of the task
2 days 18/8= 2/9
4 days 4/9
8 days 8/9
9 days 9/9
12 days 12/9 = 4/3 of the task, meaning you need less than 8
so take 3/4 of 8 = 3(8)/4 = 3(2) = 6 machines will do the task in 12 days
12x6x1/72=12x1/12=1 task by 6 machines in 12 days
