5. Mitchell works in a lab. He plans to
mix a 35% solution of acid with an
80% solution to make 70 mL of a 50%
solution. Let x represent the number
of millilitres of 35% solution. Use the
equation 0.35x + 0.8(70 – x) = 0.5(70)
to find the volume of each type of acid
used in the mixture.