In a class of 40 students, 32 offer mathematics, 24 offer physics and 4 offer neither mathematics nor physics. How many offers both mathematics and physics?

In a class of 40 students, 32 offer mathematics, 24 offer physics and 4 offer neither mathematics nor physics. How many offers both mathematics and physics?
A. 4
B. 8
C. 16
D. 20

Correct Option: Answer is D
Solution:
40

40 = 32 – x + x + 24 + 4
40 = 60 – x
x = 60 – 40
x = 20

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