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Acid and water are mixed in a vessel A in the ratio of 5 : 2 and in the vessel B in the ratio 8 : 5. In what proportion should quantities be taken out from the two vessels so as to form a mixture in which the acid and water will be in the ratio of 9 : 4?
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- 7: 2
- 2: 7
- 7: 4
- 2: 3
Correct Option: B
By alligation rule,
| = | = | ||
| 91 | 91 |
| ∴ Required ratio = | : | ||
| 91 | 13 |
= 2 : 7
