The correct answer to this question is 5. This question is likely to be found on a test for an early learner, such as a kindergarten student. It involves a number of different learning skills. One is reading comprehension, which is ensuring the student fully understands the question that is asked. If they are comprehending properly, it will allow them to answer the question correctly.
Another skill it is testing is math. If they are reading correctly, they will know that James has six rooms and has clocks in all of them except one. Using math, the student can subtract one from six, to get the correct answer of five.