Mathematics, 31.01.2020 05:54, jess7kids

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

Answers: 3

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Twenty-one students at a school have an allergy to peanuts, shellfish, or both.
 fourteen stu...