Puzzle ZVZE

I started out on the journey from the forest with a full tank of fuel, 12 gallons exactly.

However, the moment I started out, the fuel tank sprung a leak. I travelled at 50 mph until I ran out of fuel exactly 4 hours later.

I know that the car does 25 miles for each gallon.

How much fuel had I lost through the hole?

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Answer
I had lost 4 gallons.

Reasoning
I travelled at 50mph for 4 hours, which is 200 miles.

I used 25 gallons every 25 miles, so I used 8 gallons travelling those 200 miles.

I started with 12 gallons and used 8 gallons, so I lost the other 4 gallons.

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