Wine bottle worth puzzle

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Puzzle: A bottle of wine cost £10. The wine was worth £9 more than the bottle. How much was the bottle worth? Solution: A common wrong answer is £1. Now, if the bottle were really worth a £1, then the wine, being worth £9 more than the bottle, would be worth £10. Hence the wine and bottle together would be worth £11. The correct answer is that the bottle is worth 50 pence and the wine is worth £9.50. Then the two add up to £10.

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Puzzle:

A bottle of wine cost £10. The wine was worth £9 more than the bottle.
How much was the bottle worth?

Solution:

A common wrong answer is £1. Now, if the bottle were really worth a £1, then the wine, being worth £9 more than the bottle, would be worth £10. Hence the wine and bottle together would be worth £11.
The correct answer is that the bottle is worth 50 pence and the wine is worth £9.50. Then the two add up to £10.