Miss competition

How many girls took part in the Miss School competition if the nines grade made up half of the contestants, two-thirds of the remaining girls were from eighth grade, and the seventh grade were three?

Correct answer:

n =  18

Step-by-step explanation:

n/2+2/3(nn/2)+3=n  n/2+2/3 (nn/2)+3=n  n=18  n=118=18  n=18   Verifying Solution:  a=n/2=18/2=9 b=32 (na)=32 (189)=6 c=3  s=a+b+c=9+6+3=18

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