The ratio of boys to girls in a class is 3:5. If there are 15 boys, how many girls? A 20 B 25 C 30 D 10 ✓ Correct Answer: Option B 3:5 = 15:x → x = 15 × 5/3 = 25 girls. Practice Praxis Exam Prep Quizzes → Browse All Questions Study Flashcards