Ten pupils

10 pupils came to the art group .8 pupils painted with watercolors and 9 pupils painted with ink, each pupil painted with ink or watercolors. How many pupils painted water and ink at the same time?

Result

x =  7

Solution:

 (8−x)+x+(9−x)=10  x=7  x=7 =7 \ \\ (8-x)+x+(9-x)=10 \ \\ \ \\ x=7 \ \\ \ \\ x=7 \ \\ =7

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