If 50 men can do a certain job in 32 days working 8 hours per day, the part of that work which can be completed by 30 men in 64 days, working 4 hours per day is?
(a) 11/13
(b) 2/7
(c) 3/5
(d) 7/9
Sol:
Work done/total work=30*64*4/50*32*8=3/5
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