SOLUTION: 12 men can finish half a job in 35 minutes; how many more men are needed if the remaining job should be completed in 15 minutes?

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Question 970659: 12 men can finish half a job in 35 minutes; how many more men are needed if the remaining job should be completed in 15 minutes?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
12 men can finish half a job in 35 minutes;
Find how many man-minutes to complete half the job
12 * 35 = 420 man minutes, to do half the job
:
how many more men are needed if the remaining job should be completed in 15 minutes?
Let m = no. of men to accomplish this
15m = 420
m = 420/15
m = 28 men required