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At the banquet, the ratio of the number of girls is 5 : 3. Halfway through the banquet, 20 boys leave and the ratio becomes 5:4. How many girls are at the banquet?
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At the banquet, the ratio of the number of girls is 5 : 3. Halfway through the banquet, 20 boys leave and the ratio becomes 5:4. How many girls are at the banquet?

User Rajat Mehra
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(5)/(8)x-20=(5)/(9)x\\-20=(-5)/(72)x\\x=288\\(3)/(8)(288)\\108

108 girls
User DavidTaubmann
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