B
The formula for circumference is

d, or Pi times diameter
Where is the problem that we have to solve
Answer = <span>6 US gallons</span>
Hey there!
To figure out what "x" means, you can divide the numbers 126 and 14 . . .
126 divided by 14 = 9
9 x 14 = 126
9 = x
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x = 9
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Hope this helps you.
Have a great day!