Lucid

Lucid

<loo-sid>

simple; clear; plain;

something that is easy to understand.

I studied a lot and each question was lucid to me. I scored perfect.

Memory trick:
lucid reminds of lucky.
lucky it is simple.

At work:
I took a walk to think and the answer to the problem became lucid. It was solved.

(c) 2015 E. Carruthers