- 120 dB (A)
- 130 dB (A)
- 140 dB (A)
- 115 dB (A)
- 90 dB (A)
- 85 dB (A)
Q) The ratio of the number of girls to boys in class VIII is the same as the ratio of the number of boys to girls in class IX. The total number of students (boys and girls) in classes VIII and IX is 450 and 360, respectively. If the number of girls in classes VIII and IX is the same, then the number of girls in each class is.
📝 Explanation
Explanation: Given: - Number of girls in both classes is \( X \). - Total students in 8th class = 450. - Total students in 9th class = 360. The ratio condition is: \[\frac{X}{450 - X} = \frac{360 - X}{X}\] Cross-multiplying and solving: \[X^2 = (450 - X)(360 - X)\] Expanding and solving the quadratic equation: \[X^2 = 162000 - 450X - 360X + X^2\] \[0 = 162000 - 810X\] \[X = \frac{162000}{810} = 200\] So, the number of girls in each class is 200.
Explanation: Given: - Number of girls in both classes is \( X \). - Total students in 8th class = 450. - Total students in 9th class = 360. The ratio condition is: \[\frac{X}{450 - X} = \frac{360 - X}{X}\] Cross-multiplying and solving: \[X^2 = (450 - X)(360 - X)\] Expanding and solving the quadratic equation: \[X^2 = 162000 - 450X - 360X + X^2\] \[0 = 162000 - 810X\] \[X = \frac{162000}{810} = 200\] So, the number of girls in each class is 200.
WhatsApp
Facebook
Related Questions
- S wave can travel through it.
- S wave cannot travel through it.
- P wave can travel through it.
- P wave cannot travel thought it.
- CIM
- RIM / Inspector of mines
- Owner of the mines
- Sec. 12 Committee
- Safety committee
- O/A/M
- Manager
- Agent
- All above
- Owner
- Manager , Engineer , Electrical Supervisor
- Agent .Manager .Engineer
- Owner ,Agent .Manager ,Engineer
- Owner ,Agent .Manager ,Engineer, Electrical Supervisor ,Asst.manager ,Over man ,Mining Sardar & All other persons connected with use of electricity
- All of the above
- Manager
- Director of Mine Safety
- Director of the company
- Director (Pers.)
- Electrical Superintendent
- P-wave
- S-wave
- Rayleigh wave
- Radio wave
- Drums with helical grooves
- Plain cylindrical drums
- Both are equally preferred
- None of the above
- Rotary-percussive drilling
- Percussive drilling
- Rotary drilling
- Hydraulic drilling
- Single riveted butt joint
- Single riveted lap joint
- Double riveted butt joint
- Double riveted lap joint
Comment
Top Contributors
Sannith
All Categories
- Central Electricity Authority Regulations (40)
- Drilling and Blasting (48)
- GATE 2024 (10)
- General (4)
- Geology (6)
- Mines Act 1952 (50)
- Mines Creche Rules (50)
- Mining Machinery (50)
- MINING MCQs (10)
- MMR 1961 (7)
- National Conference (7)
- Rock Mechanics (1)
- Surveying (1)
- THE MINES RESCUE RULES, 1985 (60)
- Winning and Working (22)