ISEE Mathematics Achievement Question 305: Answer and Explanation
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Question: 305
5. If p pieces of candy costs c cents, 10 pieces of candy will cost
- A.
cents - B.
cents - C.
cents - D. 10pc cents
Correct Answer: B
Explanation:
B 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, say that p pieces of candy is equal to 5 pieces, and c cents is 10 cents. Therefore, 10 pieces of candy will cost 20 cents-you have twice as many pieces, so it will cost twice as much money. So, the target answer is 20. Now, Plug In your values for p and c into the choices to find the choice that equals your target answer (20). Eliminate (A) because 
= 
= 5, which is too small. 
= 
= 20, so keep (B). Remember to check the remaining choices when Plugging In. 
= = 5, so eliminate (C) as well. Cross off (D) because 10(5)(10) = 500, which is way too large. The correct answer is (B).