Dr. Frankenstein needs to make 24 liters of a 20% saline solution. He mixes a 15% saline solution with a 30 % saline solution. How much of each of the solutions will Doc need to make the 20% solution?

Sum is 17 and their difference is 3

Suppose you just purchased a digital music player and have put 8 tracks on it. after listening to them you decide that you like 4 of the songs. with the random feature on your player, each of the 8 songs is played once in random order. find the probability that among the first two songs played (a) you like both of them. would this be unusual? (b) you like neither of them. (c) you like exactly one of them. (d) redo () if a song can be replayed before all 8 songs are played.

I’m really confused and need to learn this