The ratio of milk to water in 80 litres of a mixture is 7 : 3. The quantity of water (in litres) to be added to it to make the ratio 2 : 1 is :
4
5
6
8

Question

The ratio of milk to water in 80 litres of a mixture is 7 : 3. The quantity of water (in litres) to be added to it to make the ratio 2 : 1 is : 1. 4 2. 5 3. 6 4. 8

KnowledgeBoat · Accepted Answer

Let the initial quantities of milk and water be 7x and 3x respectively. Given, The total volume of the mixture is 80 litres. ⇒ 7x + 3x = 80 ⇒ 10x = 80 ⇒ x = ⇒ x = 8. Initial Quantity of Milk : 7x = 7 × 8 = 56 litres Initial Quantity of Water : 3x = 3 × 8 = 24 litres Let W be the quantity of water added to the mixture. The quantity of milk remains unchanged. Water = 24 + W The new ratio of milk to water is required to be 2 : 1. ⇒ ⇒ 56 = 2(24 + W) ⇒ 56 = 48 + 2W ⇒ 2W = 56 - 48 ⇒ 2W = 8 ⇒ W = ⇒ W = 4. The quantity of water to be added is 4 litres. Hence, option 1 is the correct option.

Mathematics

The ratio of milk to water in 80 litres of a mixture is 7 : 3. The quantity of water (in litres) to be added to it to make the ratio 2 : 1 is :
4
5
6
8

Ratio Proportion

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The ratio of milk to water in 80 litres of a mixture is 7 : 3. The quantity of water (in litres) to be added to it to make the ratio 2 : 1 is :
4
5
6
8

What must be subtracted from each of 7, 9, 11 and 15, so that the resulting numbers are in proportion?
1
2
3
5

If p, q, and r are in continued proportion, then :
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p : r = p² : q²

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40
45
55
60