Select the number-pair in which the two numbers share a different relationship from that shared by the two numbers in the rest of the number-pairs.

82 - 42 = 40 62 - 35 = 27 84 - 66 = 18 94 - 85 = 9 Except 40, all are multiples of 9.

In a mixture of 45 litres, the ratio of wine to water is 2 : 3. If this ratio is to be 1 : 3, then what is the quantity of water needed to be added?

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