math
posted by frederick .
500 students paid rete of £7.50 and the remainder paid the full adult rete of£10.what was the total amount of money paid to the cinema that night?

number of people who paid reduced rate x
number of adult rates  500x
Total amount paid = 7.5x + 10(500x)
= 7.5x + 5000  10x
= 5000  2.5x
Was there more information? That is as far as you can go with what you have. 
Is "rete" supposed to be the "rate" (cost) of a cinema ticket?
You have omitted necessary information on the total number of people attending.
The total ticket revenue cannot be computed without knowing the number of adult tickets sold.
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