60 l of 72% alcohol and 70 l of 90% alcohol are mixed. How many liters of water should be added so that the mixture contains 60% alcohol.

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.