How much of Brand A fruit punch (10% fruit juice) must be mixed with 4 L of apple juice to create a mixture containing 40% fruit juice?

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.

The answer is -1,19,39,59