IBPS PO Prelims practice question
A dispenser tank is full of 240 litres of pure liquid soap concentrate. 60 litres is withdrawn and replaced with water; this operation is carried out twice in all. Find the final quantity of water (in litres) present in the dispenser tank.
From a IBPS PO Prelims Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (D) 132
liquid soap concentrate left after 2 operations = 240 x [(240-60)/240]2 = 108 litres. So water present finally = 240 - 108 = 132 litres.
हिंदी में प्रश्न
एक डिस्पेंसर टंकी में 240 लीटर शुद्ध लिक्विड सोप सांद्र भरा है। इसमें से 60 लीटर निकालकर पानी मिला दिया जाता है; यह प्रक्रिया कुल 2 बार की जाती है। डिस्पेंसर टंकी में अंत में उपस्थित पानी की मात्रा (लीटर में) ज्ञात कीजिए।
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सही उत्तर: (D) 132
2 बार की प्रक्रिया के बाद शेष लिक्विड सोप सांद्र = 240 x [(240-60)/240]2 = 108 लीटर। अतः अंत में उपस्थित पानी = 240 - 108 = 132 लीटर।
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