Lizzy: Billy wants to watch something fun on YouTube but doesn't know what to watch. He has the website generate 15 suggestions but, after watching each in one, he doesn't like any of them. Billy's very picky so he does this a total of 5 times before he finally finds a video he thinks is worth watching. He then picks the 5th show suggested on the final suggestion list. What number of videos does Billy watch?.
Me: Hmmm, let me think. I think this is the detailed solution:
Billy has 15 suggestions generate for him 5 times for 15 * 5 = 75 videos. There are 15 - 5 = 10 shows in the final set of suggestions he doesn't consider. This means he picks the 75 - 10 = 65th show YouTube suggests. Final answer: 65.