The ratio of boys to girls in a class is 3 to 2. If there are 30 boys, how many students are there in total?
- A. 45
- B. 50
- C. 40
- D. 60
Explanation
Three parts correspond to 30 boys, so one part is 10 and the two parts of girls are 20, giving 50 students in total. Answering 45 comes from adding the wrong number of parts. Finding the value of a single part first is the reliable route through any ratio question.
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