This is the 582nd most frequent Chinese word.
简单
Simple; easy.
简单 here describes the method used to resolve the issue, emphasizing straightforwardness or lack of complexity in approach.
他用一种简单的方法解决了问题。
He solved the problem using a simple method.
简单 in this context refers to an uncomplicated or minimalistic lifestyle, representing a philosophical or qualitative aspect of how life is lived.
生活简单并不意味着无趣。
A simple life does not mean a boring one.
简单 in this sentence is used to describe the characteristic of the math problem, indicating that it's easy to solve.