book Maths Puzzle Numerical Ability

I'm so confused please help.
Before this year's Dewey Beach 500 race, the wives of the four top GASCAR drivers competed in the Figure Eight Event to raise money for local communit

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whats a rhombus Okay I think I wrote the problem correctly this time. I need help converting this to a quadratic equation:

(3+48/N)*(N-2)-48=22

Any help would be appreciated

Thanks again


Bob