SOLUTION: There are an equal number of boys and girls in a class. if 20 more girls join the class, the ratio of boys to girls becomes 3:4. what was the original number of students in the cl

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Question 878283: There are an equal number of boys and girls in a class. if 20 more girls join the class, the ratio of boys to girls becomes 3:4. what was the original number of students in the class?
A) 160
B) 200
C) 120
D) 80
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi

x%2F%28x%2B20%29+=+3%2F4

  4x = 3x + 60

   x = 60

the original number of students in the class? 120