After evaluating his students on the final exams. Professor Oscar reviews all 10 questions on each exam. How many questions must he review if he has 5 classes with 35 students each? Give the rationale and then the answer.
Let's think step by step. For each class, he has to review the questions of 35 students, in total, he will review 10 * 35 = 350 questions. For the 5 classes, he will review a total of 350 * 5 = 1750 questions.. The answer is: 1750.

Sophie's aunt gave her $260 to spend on clothes at the mall. She bought 2 shirts that cost $18.50 each and a pair of trousers that cost $63. She then decides to purchase 4 more articles of clothing with her remaining budget. How much money would each item cost if she split the cost of each item evenly? Give the rationale and then the answer.
Let's think step by step. Sophie spent $18.50 × 2 = $37 on the two shirts. She spent in total $37 + $63 = $100 on clothes so far. She has $260 - $100 = $160 left to spend on clothes. Sophie has $160 ÷ 4 = $40 left to spend on each additional item of clothing.. The answer is: 40.

There is a rectangle that is 4 inches wide. If the rectangle's perimeter is 30 inches, what is the area of the rectangle? Give the rationale and then the answer.
Let's think step by step. Twice the height of the rectangle is 30 inches - 2 * 4 inches = 22 inches. The rectangle's height is 22 inches / 2 = 11 inches. The area of the rectangle is 4 inches * 11 inches = 44 square inches.. The answer is: 44.