SSC GD Constable previous year question
100 bikes take part in a race, including yellow and green bikes. The average speed of all bikes is 35 km/hr. The average speed of yellow bikes is 55 km/hr, and the average speed of green bikes is 30 km/hr. How many bikes are green?
Asked in SSC GD Constable 2025: 06 Feb 2025 Shift 1 (Morning) · Quantitative Aptitude
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Correct answer: (D) 80
Let green bikes = g, yellow = 100−g. 55(100−g)+30g = 3500 ⟹ 5500−25g = 3500 ⟹ g = 80.
हिंदी में प्रश्न
एक रेस में 100 बाइकें भाग लेती हैं, जिनमें पीली और हरी बाइक शामिल हैं। सभी बाइकों की औसत चाल 35 km/hr है। पीली बाइकों की औसत चाल 55 km/hr है, तथा हरी बाइकों की औसत चाल 30 km/hr है। कितनी बाइकें हरी हैं?
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सही उत्तर: (D) 80
मान लीजिए हरी बाइकें = g, पीली = 100−g। 55(100−g)+30g = 3500 ⟹ 5500−25g = 3500 ⟹ g = 80।
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