SOLUTION: The cost of pipe at Home Depot varies jointly as the length and diameter of the pipe. If 20 feet of 0.5 inch diameter pipe costs $36.60, then what is the cost of 12 feet of 0.75 in

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Question 179968: The cost of pipe at Home Depot varies jointly as the length and diameter of the pipe. If 20 feet of 0.5 inch diameter pipe costs $36.60, then what is the cost of 12 feet of 0.75 inch diameter pipe?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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The cost of pipe at Home Depot varies jointly as the length and diameter of the pipe. If 20 feet of 0.5 inch diameter pipe costs $36.60, then what is the cost of 12 feet of 0.75 inch diameter pipe?
:
How about:
%2820%2A.5%29%2F%2812%2A.75%29 = 36.60%2Fx which is: %2810%29%2F%288%29 = 36.60%2Fx
Cross multiply
10x = 8(36.60)
:
10x = 292.8
x = 292.8%2F10
x = $29.28 for 12' of .75" pipe