The majority of todays office-based jobs require thoughtful, logical decisions, as well as the ability to rationalize them.
When we try to answer a difficult question, we often actually answer a related but different question, without realizing that a substitution has taken place and this can lead to wrong decisions.
Public questions (free account) are common interview questions. They are great for practicing, or if you want to filter candidates using the classic problems.
A postcard and a stamp together cost $1.50. The postcard costs one dollar more than the stamp.
How much does the stamp cost?