Question #4e61b

1 Answer
Mar 1, 2018

7.5 litres of 10% acid
22.5 litres of 30% acid

Explanation:

Let the amount of 10% acid added is x litres.
Then the amount of 30% acid added is (30-x) litres.

Total amount of acid "molecules"
=30*25%
=7.5 litres.

x*10%+(30-x)*30%=7.5

10x+900-30x=750

-20x=-150

x=7.5

Therefore a total of 7.5 litres of 10% acid is added, and we can get
(30-7.5)=22.5 litres of 30% acid.