If '?' represents subtraction, '?' represents addition, '?' represents multiplication, and '?' represents division, what is the result of 15 ? 5 ? 3 ? 2 ? 4?
Four friends, A, B, C, and D, are sitting in a row. A is to the left of B but to the right of C. D is not at either end. What is the correct order from left to right?
Five events occurred on different days: A, B, C, D, and E. A happened before C but after B. D happened after E but before A. What is the correct sequence of events from first to last?