Answer :
If the theatre sold 225 seats out of 250, that is the 225/250. To find the percent of the fraction, you have to divide the numerator by the denominator. You get 0.9. This is a decimal. Multiply the decimal by 100 to get a percent. If you multiply 0.9 by 100, you get 90. So, if the stage is 90% full, it is 10% empty.
The answer is that the stage is 10% empty.
Hope it helps.
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