Twelve men take 6 hours to finish a piece of work. After the 12 men have worked for 1 hour, the contractor decides to call in 8 more men. How many more hours would 20 men take to complete the remaining work?
Answer: 3
Explanation
12 men took to 6 hours to complete the work.
It means there is 12 x 6= 72 units of work
Now 12men done work for one hour. So 12 x 1 =12 units of work completed.
Remaining work = 72-12= 60 units
Now the no of men=12+8= 20
So 60 units of work have to complete by 20 men
Therefore 60/20= 3 hours
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