SSAT Math Question 213: Answer and Explanation
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Question: 213
7. If 80 percent of x is 9, what is 40 percent of 2x?
- A. 3
- B. 6
- C. 9
- D. 12
Correct Answer: C
Explanation:
The answer is C
Set up a proportion to solve for x, cross multiply, and divide by 80: 
, 900 = 80x, and x = 
or 
. The next proportion calls for 2x, which is 
or 
. Follow the same procedure: 
or 
, 900 = 100x, and x = 9.
If you cut a percent in half and double the number, the result will be the same.