A dairy man purchases at Rs. 6.40 per litre of milk. He adds water and sells the mixture at Rs. 8 per litre, thereby making 37.5% profit. The ratio of water to milk received by his customer is:

1
1 ∶ 10
2
1 ∶ 9
3
2 ∶ 11
4
1 ∶ 11

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