Answer:
10 liters
Step-by-step explanation:
Let
x ----> liters of a 20% solution of acid
we know that
The number of liters of a 20% solution of acid, multiplied by 0.20 (20% in decimal form) plus 10 liters of a 30% solution of acid multiplied by 0.30 (30% in decimal form) must be equal to the amount of (x+10) liters multiplied by 0.25 (25% in decimal form)
so
The linear equation that represent this problem is equal to
[tex]0.20x+0.30(10)=0.25(x+10)[/tex]
solve for x
[tex]0.20x+3=0.25x+2.5\\0.25x-0.20x=3-2.5\\0.05x=0.5\\x=10\ L[/tex]
