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15.07.2019 •
Mathematics
Awater main for a street is being laid using mechanical joint pipe. the pipe comes in 18-foot and 20-foot sections, and a designer determines that the water main would require 14 fewer sections of 20-foot pipe than if 18-foot sections were used. find the total length of the water main.
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Ответ:
Let
x> the total length of the water main
we know that
the number of 20 ft pipes is x/20
and
the number of 18 ft pipes is x/18
Since they differ by 14 pipes,
we have the equation
x/18 - x/20 = 14
Solve for x (by canceling fractions)
20x - 18x = 14*18*20
x = (14*18*20)/2
x = 2,520 ft
therefore
the answer is
the total length of the water main is 2,520 ft
Ответ:
To solve this problem you must apply the proccedure shown below:
1. You can write the following expression, where the variable is the total length of the water main:
2. Now, solve for , as following:
Therefore, the answer is:
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explanation: