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There are 20 girls in a grade 7 class who joined the dance troupe or glee club or both. 9 girls joined the dance troupe while 14 girls joined the glee
club. How many girls joined both?


Sagot :

There were 3 girls in the Grade 7 class who joined both of the clubs.

Explanation:
Total number of girls : 20
Girls who joined club A : 9
Girls who joined club B : 14
Total number of recruited girls : 23

17 girls joined a single club
3 girls joined both clubs.
 = 17+(3)2=23