SSAT Math Question 377: Answer and Explanation
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Question: 377
5. If 70% of 3k is 12, what is 35% of 6k?
- A. 2
- B. 6
- C. 12
- D. 24
Correct Answer: C
Explanation:
C
Set up a proportion to solve for 3k, cross multiply, and divide by 210: 
, 1,200 = 210k, and k = 
or 
. The next proportion calls for 6k, which is 
. Follow the same procedure: 
, 1,200 = 100x, and x = 12.
If you cut a percent in half and double the number, the result will be the same.