In the USA, the shoe sizes for men are approximated by the equation 3f-s=24, where / represents the length of the foot in inches

Question

In the USA, the shoe sizes for men are approximated by the equation 3f-s=24, where / represents the length of the foot in inches and s represents the shoe size.
The average man's foot is 11.5 inches long. What is the average man's shoe size?

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