Question

A chemist has a 30% and a 45% acid solution. What amount of each solution should be used to make 500ml of a solution with 35% acidity?

Answer 1

\[.45x+.3(500-x)=.35\times 500\] is a good start

Answer 2

probably easiest to get rid of annoying decimal and solve
\[45x+30(500-x)=17500\]
btw in this method \(x\) represents the amount of 45% solution