a no brainer(Something that requires little mental effort or intelligence to perform or understand. The term is often applied to decisions which are straightforward or sometimes to people who appear to lack intelligence. Olga Fomicheva)
cakewalk(A mixture of the expressions "a piece of cake" and "a walk in the park". Used to describe a task that is extremely, ridiculously easy: Compared to the math class I had last semester, psych seminar should be a cakewalk Taras)
