Question 455508
4 men x 4 hours=16 man/hours
12 machines/16 man hours=3/4 machine per man-hour
36 machines/8 hours=9/2 machine/hour
(9/2 machine/hour)/(3/4 machine/man)=6 men
6 men x 8 hours x 3/4 machine=36 total machines..