I tried to do my best to solve and show work. If you need an explanation just leave a comment :)
115 less then or equal to 3(5) + 25 + 5x
the family can bowl a total of 15 games, or 3 games each
I just took the test and the correct answer that i got was B
Permutation of 50 is 50! or 50*49*48*47*46.... and so on. I doubt they actually want you to find out what 50*49*48... is, so I'd just put 50!