ISEE Mathematics Achievement Question 331: Answer and Explanation
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Question: 331
3. For all real numbers d and y, d ? y = (d × y) - (d + y).
[Example: 3 ? 2 = (3 × 2) - (3 + 2) = 6 - 5 = 1]
10 ? 2 =
- A. 20
- B. 16
- C. 12
- D. 8
Correct Answer: D
Explanation:
D In this function, simply plug in the number to the left of the weird symbol for d and the number to the right of the weird symbol for y exactly as the example directs. The function should read d ? y = 10 ? 2 = (10 × 2) - (10 + 2), which simplifies to (20) - (12) = 8. The correct answer is (D).