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2013年01月04日
考试类型: Mathematics > Standard Multiple Choice
Read the following SAT test question and then click on a button to select your answer.
A machine can insert letters in envelopes at the rate of 
per minute. Another machine can stamp the envelopes at the rate of 
per second. How many such stamping machines are needed to keep up with 
inserting machines of this kind?
A. 
B. 
C. 
D. 
E. 
