exam Maths Puzzle Numerical Ability

A 600 room hotel in Orlando is filled to capacity every night when the rate is $90 per night. For every $5 increase in the rate, 10 fewer rooms are filled. How much should the hote

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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!!! Dear sir.
My homework is quite hard for me so if you can help me i will be very grateful....
I have got to find the pairs e.g 4 times b = 4b but what is 2(x-1) and 4 times ( x-1)