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80 लीटर के मिश्रà¤...

80 लीटर के मिश्रण में दूध और पानी की मात्रा का अनुपात `7:3` है ! `2:1` अनुपात बनाने के लिए इसमें कितने लीटर पानी मिलाया जाए

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