Cross-country competition

Cross-country competition was attended by 76% of pupils of class 9.B. Class consis of 16 boys, two of whom did not run and 4 girls did not run.

How many girls go to class 9.B?

Correct result:

x =  9

Solution:

(16-2)+(x-4) = 76/100 • (16+x)

24x = 216

x = 9

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