A contractor undertook a contract for a construction work to be completed in 180 days. He engaged 120 labours. But only 1/6th of the work was done in 1/5th of the scheduled time. The additional number of labours that will be required to complete the work in time, is

A contractor undertook a contract for a construction work to be completed in 180 days. He engaged 120 labours. But only 1/6^th of the work was done in 1/5^th of the scheduled time. The additional number of labours that will be required to complete the work in time, is
1). 20
2). 40
3). 30
4). 15

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