Forty men working on a construction job had completed one-third of the job in the past 15 days. The job was behind schedule, and needed to be completed 12 days from now. Additional workers needed to...

Forty men working on a construction job had completed one-third of the job in the past 15 days. The job was behind schedule, and needed to be completed 12 days from now. Additional workers needed to be hired in order to accomplish that. How many additional workers needed to be hired?