दूध-पानी के एक मिश्रण का 2/3 भाग दूध था। मिश्रण 21 लीटर था। यदि उसमें 4 लीटर पानी मिलाया जाता है, तो नए मिश्रण में दूध का प्रतिशत ज्ञात करें।

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RRB ALP Previous Paper 2 (Held On: 9 Aug 2018 Shift 2)
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  1. 44
  2. 56
  3. 14
  4. 11

Answer (Detailed Solution Below)

Option 2 : 56
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कुल आयतन = 21 लीटर

दूध-पानी के एक मिश्रण का 2/3 भाग दूध था,

⇒ दूध का आयतन = 2/3 × 21 = 14 लीटर

⇒ पानी का आयतन = 21 – 14 = 7 लीटर

उसमें 4 लीटर पानी मिलाया गया,

⇒ पानी का नया आयतन = 7 + 4 = 11 लीटर

⇒ मिश्रण का कुल आयतन = 14 + 11 = 25

∴ दूध का प्रतिशत = 14/25 × 100 = 56%
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