In a 729 liters mixture of milk and water, the ratio of milk to water 7 : 2. To get a new mixture containing milk and water in the ratio 7 : 3, the amount of water to be added is
বিকল্পসমূহ (নিজের উত্তর যাচাই করতে ক্লিক করুন):
সঠিক উত্তর
1 (81 liters)
বিস্তারিত ব্যাখ্যা ও বিশ্লেষণ:
Solution:
Quantity of milk in 729 litre of mixture
= 7 × 729/9 = 567 litres
Quantity of water
= 729 - 567 = 162 litres
Let x litre of water be added to become ratio 7 : 3
According to the question,
7/3 = 567 / (162 + x)
Or, 162 × 7 + 7x = 567 × 3
Or, 7x = 1701 - 1134 = 567
Or, x = 567 / 7 = 81
Therefore, 81 litres of water is to be added.
