exam Maths Puzzle Numerical Ability

when sitting atop a tree and looking down at his pal joey, the angle of depression of Mack's line of sight is 31 degrees 13 minutes. If joey is know to be standing 30 feet from the

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2720 people attended the first home football game of the season. Student tickets were $3 and non-student tickets were $5. The total revenue for tickets was $11,390. How many students attended the game? Good evening ma'am or sir would you please help me in solving this radical eqution:
-> -8+(square root of)n+15=(square root of)n-1

Thank you very much!!!