In a school, there are 20 teachers who teach mathematics or physics. Of these, 12 teachers teach only mathematics and 4 teachers teach both physics and mathematics. How many teachers teach only physics?
Given:
Total teachers = 20
Teachers teaching only Mathematics = 12
Teachers teaching both Mathematics and Physics = 4
We are to find the number of teachers who teach only Physics
Formula Used:
Only Physics = Total - (Only Math + Both)
Solution:
Only Physics = 20 - (12 + 4) = 20 - 16 = 4
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