A chemist needs to create 10 liters of a 25% acid solution by mixing a 10% acid solution with a 30% acid solution. How many liters of each solution should the chemist use?
a) 4 liters of 10% solution and 6 liters of 30% solution
b) 6 liters of 10% solution and 4 liters of 30% solution
c) 5 liters of 10% solution and 5 liters of 30% solution
d) 7 liters of 10% solution and 3 liters of 30% solution