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Katie is teaching a class of thirty pupils, of which fourteen are girls. She knows that there are twenty-two pupils who are right-handed.

What is the minimum number of girls who are right-handed in this class?

 Dec 20, 2019
 #1
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There can be a minumum of 6 right handed girls.

 Dec 20, 2019
 #2
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30 pupils - 14 girls = 16 boys

 

If all the 16 boys were righ-handed, then:

 

22 - 16 boys = 6 girls - which would the minimum number of girls who are right-handed.

 Dec 20, 2019

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