729 ml of a mixture contains milk and water in the ratio of 7 : 2. How much more water is to be added to get a new mixture containing milk and water in the ratio of 7 : 3?729 मिली मिश्रण में दूध और पानी 7 : 2 के अनुपात में हैं। 7 : 3 के अनुपात वाला नया मिश्रण प्राप्त करने के लिए कितना और पानी मिलाया जाना चाहिए?
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Correct answer: A. 81 ml81 मिली
Explanation
In 729 ml with ratio 7 : 2, milk = 729 × 7/9 = 567 ml and water = 729 × 2/9 = 162 ml. Milk stays the same, so for 7 : 3 the water required = 567 × 3/7 = 243 ml. Water to be added = 243 − 162 = 81 ml.729 मिली में 7 : 2 के अनुपात से दूध = 729 × 7/9 = 567 मिली और पानी = 729 × 2/9 = 162 मिली। दूध अपरिवर्तित रहता है, अतः 7 : 3 के लिए आवश्यक पानी = 567 × 3/7 = 243 मिली। मिलाया जाने वाला पानी = 243 − 162 = 81 मिली।More Mathematical Reasoning and Aptitude questions
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