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25 Jun 2012, 09:32
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B
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Difficulty:
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Question Stats:
92% (01:09) correct
8%
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based on 594
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A copy machine, working at a constant rate, makes 35 copies per minute. A second copy machine, working at a constant rate, makes 55 copies per minute. Working together at their respective rates, how many copies do the two machines make in half an hour ?
A. 90
B. 2,700
C. 4,500
D. 5,400
E. 324,000
A. 90
B. 2,700
C. 4,500
D. 5,400
E. 324,000
25 Jun 2012, 09:48
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Bookmarks
A copy machine, working at a constant rate, makes 35 copies per minute. A second copy machine, working at a constant rate, makes 55 copies per minute. Working together at their respective rates, how many copies do the two machines make in half an hour ?
A. 90
B. 2,700
C. 4,500
D. 5,400
E. 324,000
Together the two machines make 35+55=90 copies per minute. So, in half an hour they will make 90*30=2,700 copies.
Answer: B.
A. 90
B. 2,700
C. 4,500
D. 5,400
E. 324,000
Together the two machines make 35+55=90 copies per minute. So, in half an hour they will make 90*30=2,700 copies.
Answer: B.
General Discussion
15 Nov 2012, 00:59
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\(Rate1+Rate2=CombinedRate\)
\(\frac{35}{1min}+\frac{55}{1min}=\frac{90}{1min}\)
\(\frac{90}{1min}(30min)=2,700\)copies
Answer:B
\(\frac{35}{1min}+\frac{55}{1min}=\frac{90}{1min}\)
\(\frac{90}{1min}(30min)=2,700\)copies
Answer:B
