Two classes want to collect money. Boys are four-seventh pupils. In time did not pay a quarter of the boys and a sixth of girls, which mean 12 sinners. How many pupils attend these two classes?

Correct answer:

x =  56

Step-by-step explanation:

4/7·1/4·x + (1-4/7)·1/6· x = 12

18x = 1008

x = 1008/18 = 56

x = 56

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