A store sells pens for $2 each and notebooks for $5 each. Sarah bought a total of 10 items and spent $32. How many notebooks did she buy?

✓ Correct Answer: Option C

Let N be notebooks and P be pens. N + P = 10 and 5N + 2P = 32. Solving the system, from N + P = 10, P = 10 - N. Substitute: 5N + 2(10 - N) = 32. This simplifies to 3N + 20 = 32, so 3N = 12, and N = 4 notebooks.