UP Police Constable practice question
A tank is full of water. First, 2/5 of the water is removed. Then 1/4 of the remaining water is removed. Then half of what is left is removed. After all this, 54 litres of water remain. What was the original capacity of the tank?
From a UP Police Constable Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (B) 240 litres
Let capacity = C. Remaining fraction = (3/5) × (3/4) × (1/2) = 9/40. So (9/40)C = 54, giving C = 54 × 40/9 = 240 litres.
हिंदी में प्रश्न
एक टंकी पानी से भरी है। पहले पानी का 2/5 भाग निकाला जाता है। फिर शेष पानी का 1/4 भाग निकाला जाता है। फिर जो बचता है उसका आधा भाग निकाला जाता है। इन सबके बाद 54 लीटर पानी शेष बचता है। टंकी की मूल क्षमता क्या थी?
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
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सही उत्तर: (B) 240 लीटर
मान लीजिए क्षमता = C। शेष भिन्न = (3/5) × (3/4) × (1/2) = 9/40। अतः (9/40)C = 54, जिससे C = 54 × 40/9 = 240 लीटर।
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