Italian writer

There were 17 children in the barracks with an Italian writer. 6 children ordered a book in an Italian original and 12 children in the translation. How many children ordered a book in both languages if the three children did not order it?

Result

x =  4

Solution:

x=(6+12)−(17−3)=4x=(6 + 12) - (17-3)=4

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