math
posted by mike .
If a job takes 64 men to complete in 15 days, how many more men will take to complete the job in 12 days?

64*15 = 12n
let n be number of workers
divide both sides by 12
(64*15)/12 = (12n)/12
80 = n
thus it takes 80 men to complete the job in 12 days.