If 10 masons working 7 hours daily can build 28 water tanks in 16 days – McqOptions

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1.	If 10 masons working 7 hours daily can build 28 water tanks in 16 days, how many days will 12 masons working 6 hours daily take to build 36 water tanks ?
A.	20
B.	21
C.	22
D.	19
Answer» B. 21

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