In a school of 1200 students, teacher-to-student ratio is 1:15. It increases to 3:40. How many teachers joined?
- 30
- 20
- 18
- 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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اس سوال کو وضاحت کے ساتھ پڑھیں
- 12
- 13
- 14
- 15
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- 19.5
- 20.5
- 21.5
- None of these
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- 40
- 45
- 50
- None of these
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