Twenty-one students at a school have an allergy…

Discussion in 'Mathematics' started by Kobeld, Sep 19, 2018.

  1. Kobeld

    Kobeld New Member

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    Twenty-one students at a school have an allergy to peanuts, shellfish, or both. Fourteen students at the school are allergic to peanuts. Twelve students at the school are allergic to shellfish. How many of the students are allergic to both peanuts and shellfish? A 12 B 7 C 5 D 2
     
  2. Dangnhutun

    Dangnhutun New Member

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    Add the 14 and the 12. You get 26, then subtract it by the total number of students, 21, then you get 5.
     

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