If 9 workers can build a wall in 28 hours, then how many workers will be required to do the same work in 21 hours?

If 9 workers can build a wall in 28 hours, then how many workers will

1.	If 9 workers can build a wall in 28 hours, then how many workers will be required to do the same work in 21 hours?
A.	15
B.	24
C.	18
D.	12
Answer» E.

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If 9 workers can build a wall in 28 hours, then how many workers will be required to do the same work in 21 hours?

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