Question

What quantity of a 65% acid solution must be mixed with a 25% solution to produce 600 mL of a 45% solution?

Answer 1

Lets say x is quantity
65%x+25%(600-x)=45%of 600
.65x+.25(600-x)=.45*600
.65x+150-0.25x=270
0.4x=120
x=300ml