Mixture problem

Question

A chemist needs a solution that is 80% acid, but he only has solutions that are 10% and 90% acid If the chemist measures 140 mL of the 90% solution, how many

milliliters of the 10% solution should he add to

make an 80% solution?

a. Write an equation to represent the situation.

b. How many milliliters of the 10% acid solution should the chemist add?

c. Is your answer reasonable? Explain.

Answer 1

(0.90)(140) + 0.10x = (0.80)(140 + x

Can you solve for x and answer?