SOLUTION: a bridge take 12 cubic yards of concrete to make it 4 inches thick. I need to write a direct variation equation that relates c( cubic yds of concrete) and t (thickness in inches).

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Question 859613: a bridge take 12 cubic yards of concrete to make it 4 inches thick. I need to write a direct variation equation that relates c( cubic yds of concrete) and t (thickness in inches). Then I need to determine how many cubic yds of concrete is needed to make the bridge 6 inches thick.
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
4/6=12/x
We are only changing one (height/depth) of the three dimensions.

x=18 cubic yds