self Maths Puzzle

3, 2, 3, 10, 63, ?

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self Other Question

A man and his wife raced through the streets. They stopped and the husband got out of the car. When he came back, his wife was dead and there was a stranger in the car. 20% of a 6 liter solution and 60% of 4 liter solution is mixed.What percentage of the mixture of solution