Q. 504.7( 28 Votes )

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.

Answer :

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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