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:

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

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