Hi All,
This question is essentially about ratios, so the math can be done in a variety of ways (using fractions, decimals, percents, etc.). Here's a way to get to the correct answer with a little less "math work"
We're told that a machine manufactures 36 staplers in 28 minutes. We're asked how many staplers would be manufactured in 1 hour and 45 minutes.
1 hour and 45 minutes = 60+45 = 105 minutes
28 does NOT divide evenly into 105, but we can still use some estimation here...
(28 minutes)(4) = 112 minutes, so using this estimate, we'll end up with a total that is a little BIGGER than it should be.
(36 staplers)(4) = 144 staplers. Now, we know that this is TOO BIG, so we're looking for an answer that is a little below 144. With a ratio of 36 staplers per 28 minutes, we know that a little more than 1 stapler is made per minute. Since we're dealing with a calculation that is 7 minutes TOO BIG, the difference in staplers would have to be a little more than 7.
144 - (a little more than 7) = about 136
Final Answer:
GMAT assassins aren't born, they're made,
Rich
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