In a class of 50 students 40 students offered P... - JAMB Mathematics 2019 Question
In a class of 50 students, 40 students offered Physics and 30 offered Biology. How many offered both Physics and Biology?
A
42
B
20
C
70
D
54
correct option: b
n(Total) = 50
n(Physics) = 40
n(Biology) = 30
Let x = n(Physics and Biology)
Hence,
n(Physics only) = 40 -x
n(Biology only) = 30 - x
40 - x + 30 - x + x = 50
70 - x = 50
x = 20
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