In a school of 1200 students, teacher-to-student ratio is 1:15. It increases to 3:40. How many teachers joined?
Answer: 10
Explanation
Original: 1 teacher per 15 students → 1200 ÷ 15 = 80 teachers
New ratio: 3 teachers per 40 students → (1200 ÷ 40) × 3 = 30 × 3 = 90 teachers
Teachers joined = 90 - 80 = 10
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