In a school, 220 students offer Biology or Mathematics or both. 125 offer Biology and…

Mathematics JAMB 2002

In a school, 220 students offer Biology or Mathematics or both. 125 offer Biology and 110 mathematics. How many offer Biology but not Mathematics?

  • 95
  • 80
  • 125
  • 110 checkmark

The correct answer is: D

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
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