Two tanks, X and Y, contain mixtures of milk and water. Tank X has them in the ratio 3:1, while Tank Y has them in the ratio 7:3. If 12 litres are taken from X and 18 litres from Y and mixed in a third tank, what is the ratio of milk to water in the new mixture?

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1. From tank X: milk = $12	imes\frac{3}{4}=9$ L, water = $3$ L.
2. From tank Y: milk = $18	imes\frac{7}{10}=12.6$ L, water = $5.4$ L.
3. Total milk = $9+12.6=21.6$ L, total water = $3+5.4=8.4$ L.
4. Ratio = $21.6:8.4 = 18:7$. **Final ratio = 18:7.**
FINAL_ANSWER: a

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