The majority of today's office-based jobs require an understanding of numerical information (numbers, tables, charts) and the ability to rationalize them.
Being able to read charts quickly and accurately is an integral part of most office-based jobs today.
Public questions (free account) are common interview questions. They are great for practicing, or if you want to filter candidates using the classic problems.
The charts below show the number of cars John sold last year and the profit per car he made.
How much did John earn last year?