2019
Mathematics
67ca00ce0c643c71d77dee1f
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 Answer: 20
Explanation
n(Total) = 50 n(Physics) = 40 n(Biology) = 30 Let n(Physics and Biology) = x n(Physics only) = 40 -x n(Biology only) = 30 - x 40 - x + 30 - x + x = 50 70 - x = 50 x = 20
n(Total) = 50 n(Physics) = 40 n(Biology) = 30 Let n(Physics and Biology) = x n(Physics only) = 40 -x n(Biology only) = 30 - x 40 - x + 30 - x + x = 50 70 - x = 50 x = 20THIS WEEK's
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