IBM Company Numerical Ability Time and Work

Mr. X has to build a wall 1000 metres long in 50 days. He employs 56 men but at the end of 27 days finds that only 448 metres are built. How many more men must be employed so that the work may be finished in time?

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is there any chance to 2012 passout students in ibm,if any chance please tell me.
17,12,20,24,23,34,26,48