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In a school 220 students offer Biology or Mathe... - JAMB Mathematics 2002 Question

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 option: d

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

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