SOLUTION: A class of 30 students took two quizzes. 16 passed the first quiz and 20 passed the second. if four students failed both quizzes, how many passed both?

Question 1012931: A class of 30 students took two quizzes. 16 passed the first quiz and 20 passed the second. if four students failed both quizzes, how many passed both?
Answer by macston(5194) (Show Source): You can put this solution on YOUR website!
16 passed the first and four failed both. That is
20 out of 30, leaving 10 who failed the first and
passed the second. Of 20 who passed the second,
10 had failed the first, leaving 10 who passed both.
.
So 4 failed both, 10 failed the first and passed the
second, 6 passed the first and failed the second, and
10 passed both. Total: 30
.
Four failed both, ten passed both, and 16 passed one
of two. Total: 30.
.
ANSWER: Ten students passed both tests.
.

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