A machine can insert letters in envelopes at the rate of 120 per minute. Another machine can stamp the envelopes at the rate of 3 per second. How many such stamping machines are needed to keep up with 18 inserting machines of this kind?
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The math couldn't be simpler : 12. No, where I had a problem was the grammar. Is the first such machines the 120 or the 180? Coming off a day dealing with people who never use a proper noun unless you shove bamboo under their fingernails, I got totally lost looking for referents. Had to ask an 11 year old. Who derisivley pointed out the distinction between stamping & inserting machines.
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So if I seem unduly dense, just slam the table and call me Ronnie. I'll understand. For now.
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