A mason can build a wall in 18 hours. After 9 hours he takes a break. What fraction of the wall is yet to be built?

A mason can build a wall in 18 hours. After 9 hours he takes a break.

1.	A mason can build a wall in 18 hours. After 9 hours he takes a break. What fraction of the wall is yet to be built?
A.	0.9
B.	0.25
C.	0.5
D.	0.2
Answer» D. 0.2

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A mason can build a wall in 18 hours. After 9 hours he takes a break. What fraction of the wall is yet to be built?

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