To solve this problem, we first need to determine the initial quantities of milk and water in the mixture.

1. The total ratio of milk to water is 7:2, which adds up to 9 parts.
2. Each part of the mixture is therefore 630 ml / 9 = 70 ml.
3. The quantity of milk is 7 parts * 70 ml/part = 490 ml.
4. The quantity of water is 2 parts * 70 ml/part = 140 ml.

Next, we need to find out how much water must be added to make the ratio 7:3.

1. If the quantity of milk remains constant at 490 ml, and the ratio of milk to water is 7:3, then the total ratio is 10 parts.
2. Each part of the new mixture is therefore 490 ml / 7 = 70 ml.
3. The quantity of water in the new mixture should be 3 parts * 70 ml/part = 210 ml.
4. Therefore, the amount of water that must be added is 210 ml - 140 ml = 70 ml.

So, the correct answer is 70 ml.

Question

To solve this problem, we first need to determine the initial quantities of milk and water in the mixture.

1. The total ratio of milk to water is 7:2, which adds up to 9 parts. 
2. Each part of the mixture is therefore 630 ml / 9 = 70 ml.
3. The quantity of milk is 7 parts * 70 ml/part = 490 ml.
4. The quantity of water is 2 parts * 70 ml/part = 140 ml.

Next, we need to find out how much water must be added to make the ratio 7:3.

1. If the quantity of milk remains constant at 490 ml, and the ratio of milk to water is 7:3, then the total ratio is 10 parts.
2. Each part of the new mixture is therefore 490 ml / 7 = 70 ml.
3. The quantity of water in the new mixture should be 3 parts * 70 ml/part = 210 ml.
4. Therefore, the amount of water that must be added is 210 ml - 140 ml = 70 ml.

So, the correct answer is 70 ml.

Knowee AI · Accepted Answer

To solve this problem, we first need to determine the initial quantities of milk and water in the mixture.

1. The total ratio of milk to water is 7:2, which adds up to 9 parts. 
2. Each part of the mixture is therefore 630 ml / 9 = 70 ml.
3. The quantity of milk is 7 parts * 70 ml/part = 490 ml.
4. The quantity of water is 2 parts * 70 ml/part = 140 ml.

Next, we need to find out how much water must be added to make the ratio 7:3.

1. If the quantity of milk remains constant at 490 ml, and the ratio of milk to water is 7:3, then the total ratio is 10 parts.
2. Each part of the new mixture is therefore 490 ml / 7 = 70 ml.
3. The quantity of water in the new mixture should be 3 parts * 70 ml/part = 210 ml.
4. Therefore, the amount of water that must be added is 210 ml - 140 ml = 70 ml.

So, the correct answer is 70 ml.

A vessel contains 630 ml of mixture of milk and water in the ratio 7 : 2. How much water must be added to make the ratio 7 : 3?Options70 ml80 ml50 ml60 ml

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