单选题
If w widgets cost c cents, how many widgets can you get for d dollars?
【正确答案】
A
【答案解析】Use TACTIC 2. If 2 widgets cost 10 cents, then widgets cost 5 cents each, and for 3 dollars, you can get 60. Which of the choices equals 60 when w = 2, c = 10, and d = 3? Only A.
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