ISEE Mathematics Achievement Question 302: Answer and Explanation

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Question: 302

2. If 10 magazines cost d dollars, how many magazines can be purchased for 3 dollars?

  • A.
  • B. 30d
  • C.
  • D.

Correct Answer: D

Explanation:

D This is a Plugging In question because there are variables in the choices. Plug In a value, work through the problem to find a target answer, and then check each of the choices to see which yields the target answer. For instance, Plug In 6 for d dollars. If 10 magazines cost $6, then $3 would buy 5 magazines-you spend half as much money, so you can get only half as many magazines. So 5 is the target answer. Now, plug 6 into the choices to see which answer yields 5, the target answer. Eliminate (A) because = = 1.8 does not equal 5. Eliminate (B) because 30(6) is way too large. Choice (C) is a fraction, = , so it will not equal 5. Choice (D) works, as = 5, so keep this choice. The correct answer is (D).

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