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Analytical Puzzles Hard 2 min

A class has 40 students. 22 study mathematics, 18 study science, and 10 study both. How many study exactly one of the two subjects?

Hint
Remove the students counted in both groups.

Answer

20 students.

Explanation

Exactly one = (22-10) + (18-10) = 20.

Step-by-Step Solution

Only mathematics = 12.
Only science = 8.
Exactly one = 12+8 = 20.
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