Riddle
A large truck is crossing a bridge 1 mile long. The bridge can only hold 14000 lbs, which is the exact weight of the truck. The truck makes it half way across the bridge and stops. A bird lands on the truck. Does the bridge collapse?
Answer
Take a moment to solve it, then reveal the answer below.
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Answer
No, it does not collapse. Because it has driven a half mile - you would subtract the gas used from the total weight of the truck.
Why it works
The trick is in the assumption the setup pushes you toward.
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