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729 ml of a mixture contains milk and water in the ratio 7 : 2. How much more water is to be added to get a new mixture containing milk and water in the ratio 7 : 3 ?
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- 81 ml
- 60 ml
- 71 ml
- 52 ml
Correct Option: A
In 729 ml of mixture,
| Milk = | × 729 = 567 ml | |
| 9 |
| Water = | × 729 = 162 ml | |
| 9 |
Let x ml of water be mixed.
| ∴ | = | ||
| 162 + x | 3 |
⇒ 162 × 7 + 7x = 567 × 3
⇒ 1134 + 7x = 1701
⇒ 7x = 1701 – 1134 = 567
| ⇒ x = | = 81 ml. | |
| 7 |
