90% acid solution (90% pure acid and 10% water) and 97% acid solution are mixed to obtain 21 litres of 95% acid solution. How many litres of each solution are mixed?
Let the quantity of 90% acid solution be x litres and
The quantity of 97% acid solution be y litres
According to the question,
x + y = 21...(1)
and 90% of x + 97% of y = 95% of 21
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