SSAT Math Question 578: Answer and Explanation
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Question: 578
7. If 3x - 6 = 21, then what is x ÷ 9 ?
- A. 0
- B. 1
- C. 3
- D. 6
Correct Answer: B
Explanation:
Note that the question asks for 
, not just for x. Start with 3x - 6 = 21. Add 6 to both sides, and 3x = 27. Divide by 3 on each side, and x = 9. Plug this into the equation: = 
= 1. The correct answer is (B).