Two solutions of 90% and 97% purity are mixed resulting in 21 litres of mixture of 94 % purity. How much is the quantity of the first solution in the resulting mixture?
First solution = 3/7 x 21 = 9L
0, 2, 8, 14, ?, 34
1, 4, 2, 8, 6, 24, 22, 88, ?
1, 4, 9, 16, 25, ?
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