A mason can build a wall in 70 hours. After 7 hours he takes

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A mason can build a wall in 70 hours. After 7 hours he takes a break. What fraction of the wall is yet to be built?

∵ A mason makes a wall in 70 hours.

∴ Part of wall built by the mason in 7 hours =	7
	70

=	1
	10

∴ Remaining part = 1 –	1
	10

=	9	= 0.9
	10