2002
Mathematics
67ca00ce0c643c71d77dee1f
In a school, 220 students offer Biology or Mathematics or both. 125 offer Biology and 110 mathematics. How many offer Biology but not Mathematics?
A.
95
B.
80
C.
125
D.
110
Correct Answer: 110
Explanation
Hint: Represent the question in a venn diagram, such that n(B ∩ M) = x n(B) only = 125-x n(M) only = 110-x => 125-x + 110-x + x = 220 => x = 15. n(B) only = 125 - 15 = 110
Hint: Represent the question in a venn diagram, such that n(B ∩ M) = x n(B) only = 125-x n(M) only = 110-x => 125-x + 110-x + x = 220 => x = 15. n(B) only = 125 - 15 = 110THIS WEEK's
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