A printer can print 15 pages an hour. How many pages can three printers print in 12 minutes at the same rate?
A. 3
B. 4
C. 6
D. 8
E. 9
The OA is E.
If a printer can print 15 pages an hour, then it can print 15/60 = 1/4 pages per minute, right?
A printer in 12 minutes can print 12*1/4 = 3 pages. If three printers work at the same rate can print 3*3 = 9 pages in 12 minutes, right?
Please, can any expert explain another way to solve this PS question for me? Thanks.
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Hi swerve,
We're told that a printer can print 15 pages an HOUR. We're asked for the number of pages that three printers can print in 12 MINUTES at the same rate. This is a rate question that requires some 'unit conversion'; you can do the math in several different ways though.
To start, since 1 printer can print 15 pages in 1 HOUR, then 3 printers would print a total of 45 pages in 1 hour. While 12 minutes might seem like a 'strange' number, an hour = 60 minutes, so 12 minutes would be exactly 12/60 = 1/5 of an hour.
Since the three printers print 45 total pages in 1 hour, they would print 45/5 = 9 pages total in 12 minutes.
Final Answer: E
GMAT assassins aren't born, they're made,
Rich
We're told that a printer can print 15 pages an HOUR. We're asked for the number of pages that three printers can print in 12 MINUTES at the same rate. This is a rate question that requires some 'unit conversion'; you can do the math in several different ways though.
To start, since 1 printer can print 15 pages in 1 HOUR, then 3 printers would print a total of 45 pages in 1 hour. While 12 minutes might seem like a 'strange' number, an hour = 60 minutes, so 12 minutes would be exactly 12/60 = 1/5 of an hour.
Since the three printers print 45 total pages in 1 hour, they would print 45/5 = 9 pages total in 12 minutes.
Final Answer: E
GMAT assassins aren't born, they're made,
Rich
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Scott@TargetTestPrep
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The rate of 3 printers is 45 pages per hour, and, since 12 minutes = 1/5 of an hour, the 3 printers can print 45 x 1/5 = 9 pages in 12 minutes.swerve wrote:A printer can print 15 pages an hour. How many pages can three printers print in 12 minutes at the same rate?
A. 3
B. 4
C. 6
D. 8
E. 9
Answer: E
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