Algebra Mixture problem

Question

473 ml of 70% alcohol is combined with 473 ml of 90% alcohol and 473 ml of water. What is the percentage of alcohol in the mixture ? 

 

I'm getting confused on how to incorporate ''473 ml of water'' into this equation can you please help ?

Answer 1

70% of 473 = 331.1

 

90% of 473 = 425.7

 

756.8 mL of alcohol out of 3*473

 

756.8/(3 * 473) = 0.532981 

 

Almost 53.3%