exam Maths Puzzle Numerical Ability

28) YOU ARE SELLING TICKETSFOR A HIGH SCHOOL PLAY. STUDENT TICKETS COST $4 AND GENERAL ADMISSION COSTS $6. YOU SELL 525 TICKETS AND COLLECT $2876. USE THE FOLLOWING VERBAL MODEL

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8x(4.7-x)=0

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Please help.

A roof rises 4.25 ft over a horizontal distance of 17.15 ft.
What is the slope of the roof to the nearest hundredth?

Thanks
JMS