[poll id=”108″]
ANSWER: B. 40
For these type of problems, the reasonable way to solve it would be algebraically. However, on the QR of the OAT, there are questions that are solved quicker via plugging in answer choices than algebraically, and when time is of the essence on the OAT (especially on the math), this route may be best.
Start with 32. If you half it, that is 16. One eighth of 32 is 4. Thus the difference between these numbers is 12.
Proceed to 40. Half of 40 = 20. One eighth of 40 is 5. Thus, the difference is 20-5 = 15, which is the answer.