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A class of 30 students took two quizzes. Sixteen passed the first quiz and 20 passed the second quiz. If four students failed both quizzes, how many pass both?

2 answers

make a Venn diagram
let the number who passed both tests be x
fill in the values given,
then
(16-x) + x + (20-x) + 4 = 30
-x = -6
x = 6

uhmm.. I think the answer is 10.

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