SSAT Math Question 621: Answer and Explanation
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Question: 621
2. If 10 magazines cost d dollars, then in terms of d, how many magazines can be purchased for 3 dollars?
- A.
- B. 30d
- C.
- D.
Correct Answer: D
Explanation:
This is a Plugging In question because there are variables in the choices and the question stem contains the phrase in terms of. 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. Remember to try all five choices when Plugging In, so check (E) as well: 
= 
= 20. Eliminate (E) since 20 ≠ 5. The correct answer is (D).