This problem comes from Car Talk. An 18-wheeler truck driver has an unreliable fuel gauge. His fuel tank is a cylinder that lies horizontally and is 20 inches in diameter.
He wants to know when his tank will be 1/4 full. He checks his fuel by putting a dip-stick vertically in his tank.
Solve for x in the diagram (when the fuel tank will be 1/4 full).
Send your solution by the end of the month to:
David Pleacher