# 90% and 97% pure acid solutions are mixed to obtain 21 litres of 95% pure acid solution. Find the quantity of each type of acids to be mixed to form the mixture.

Let the quantity of 90% acid solution be x litres.

quantity of 97% acid solution = (21 - x) litres

Now,

90% of x + 97% of (21 - x) = 95% of 21

7x = 21(97 - 95)

7x = 42

x = 6

Thus, 90% acid solution = 6 litres

97% acid solution = 21 - 6 = 15 litres

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