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?
15 liters
9 liters
12 liters
6 liters
A
12 liters
B
6 liters
C
15 liters
D
9 liters
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By allegation rule
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