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Hi there! Have questions about your homework? At Brainly, there are 60 million students who want to help each other learn. Questions are usually answered in less than 10 minutes. Try it for yourself by posting a question! :D

Original Number of students: Girls: 8x = 8 (13) = 104 Boys: 5x = 5(13) = 65 104 : 65 = 8 : 5 (in lowest term, GCF of 104 and 65 is 13.)

ANSWER: There were 104 girls in Math Club at the start.

Check: When 4 girls and 19 boys are added/joined, the ratio becomes 9:7. Girls: 104 + 4 = 108 Boys: 65 + 19 = 84 108 : 84 = 9: 7 (in lowest term, GCF of 108 and 84 is 12.)