*$_Hardness of green sand mould increases with?

1.	*$_Hardness of green sand mould increases with?
A.	Increase in moisture content beyond 6 percent
B.	Increase in permeability
C.	Decrease in permeability
D.	Increase in both moisture content and permeability
Answer» D. Increase in both moisture content and permeability

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*$_Hardness of green sand mould increases with?

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