The majority of today's office-based jobs require an understanding of numerical information (numbers, tables, charts) and the ability to rationalize them.
The data-analysis process often comes down to solving a simple linear equation to get the desired information.
Public questions (free plan) are common interview questions. They are great for practicing, or if you want to filter candidates using the classic problems.
John ate half of the apples he had. After that he gave 2 apples to his sister Mary, which left him with only 3 apples.
How many apples did John have before all that?