1. A recipe for 4 servings requires 6 cups of flour. How many cups are needed for 10 servings?
Answer: B. 15 cups
Explanation: This is a proportion problem. Cups per serving = 6/4 = 1.5. For 10 servings: 10 × 1.5 = 15 cups.
2. What is the value of the expression 2a + 3b when a = 4 and b = 2?
Answer: C. 14
Explanation: Substitute the values: 2(4) + 3(2) = 8 + 6 = 14.
3. A box contains 12 red marbles, 8 blue marbles, and 5 green marbles. What is the probability of randomly selecting a blue marble?
Answer: A. 8/25
Explanation: Total marbles = 12 + 8 + 5 = 25. Probability of blue = Number of blue / Total = 8/25.
4. The perimeter of a square is 36 inches. What is the length of one side?
Answer: B. 9 inches
Explanation: A square has 4 equal sides. Perimeter = 4 × side. So, side = Perimeter / 4 = 36 / 4 = 9 inches.
5. Which of these numbers is a prime number?
Answer: C. 31
Explanation: A prime number is only divisible by 1 and itself. 31 meets this criteria, while 21, 27, and 33 are divisible by other numbers (3, 7, 11).