The correct answer to this question is $225. A question like this could appear on a math test, but would more than likely appear on a test to determine one's IQ. It would be more realistic to see it on an IQ test because the question can be very confusing, and the answer isn't the most obvious.
One who may not have the highest IQ may have difficulty solving this question because they must read, analyze, and calculate carefully. A person with a high IQ would be able to answer this question using their analysis and mathematical skills quickly.