If a carpenter completes 3/8th of his work in 6 days, then how many more days will he require completing his remaining work?

10

12

6

16

As 3/8th of the work is completed, the work remaining is 5/8th of the total. (3/8):6::(5/8):x x = 6*(5/8)/(8/3) x = 10

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