Algebra · Ratio and proportion · Linear equations · Word problem
During the first lesson of the day, the number of boys and the number of girls in a class were in the ratio \(3 : 4\). Before the second lesson another \(4\) girls joined the class and \(4\) boys left it, and the ratio became \(2 : 5\). How many more girls than boys were in the class during the second lesson?
- A \(5\)
- B \(6\)
- C \(7\)
- D \(8\)
- E \(12\)
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Slovenian High School Mathematics Competition for Vega Awards (MaSSA), regijsko (regional) round 2015, 1. letnik, category A, problem A3. Organized by DMFA Slovenije (Society of Mathematicians, Physicists and Astronomers of Slovenia). Source