2015 AMC 10B Problem 4

Since $\frac 13 > \frac 14 > \frac 15,$ we know Beth ate more than Cyril and Cyril ate more than Alex. Thus, those three are in order. The amount Dan ate is $$1- \dfrac 13 - \dfrac 14 - \dfrac 15 = \dfrac{13}{60}.$$ This is greater than $\frac 15$ and less than $\frac 14 ,$ so Dan is in between Cyril and Alex. This makes the order Beth, Cyril, Dan, Alex. Thus, the correct answer is C .