Problem:

Solution A is an 80% acid solution. Solution B is a 30% acid solution.

(a) Find the amount of Solution A (in mL) that must be added to 500 mL of Solution B in order to produce a 70% acid solution.

(b) Find the amount of Solution A and Solution B (in mL) that can be combined in order to form a 100 mL solution that is 50% acid.

(c) Does there exist a combination of Solution A and Solution B that is 90% acid?