At a work site, a gang of labourers undertake to finish certain activity in 8 hours

At a work site, a gang of labourers undertake to finish certain activity in 8 hours. Unfortunately, right from the start of the work, four of them remain absent, but the rest manage to complete the work in 10 hours. What is the original number of labourers in the gang?
(a) 24
(b) 20
(c) 16
(d) 12

Anurag Mishra Professor Asked on 4th May 2016 in Maths.
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    Answer: (b) 20 

    Anurag Mishra Professor Answered on 4th May 2016.
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