exam Maths Puzzle Numerical Ability

If a bridge that is one mile long is attached to the ground on either side, and you cut it in the middle and add one foot, what is the height of how far the bridge bows up in the middle?

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I dont understand how to start the problem or finish it either. I have been trying to figure out how this is set up but I am confused. So far I not sure if this is the right set up: n-4=96

Word Problem:
The product of a number and 4 less than the number is 96. Find the number.