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A certain photocopying machine can make 10 copies every 4 seconds. At 03 Jul 2020, 04:38
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A certain photocopying machine can make 10 copies every 4 seconds. At this rate, how many copies can the machine make in 6 minutes?

(A) 900
(B) 600
(C) 360
(D) 240
(E) 15O
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A certain photocopying machine can make 10 copies every 4 seconds. At 03 Jul 2020, 04:50
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A certain photocopying machine can make 10 copies every 4 seconds.
=> 10 copies in 4 seconds.
=> 2.5 copies in 1 second.

6 minutes have 360 seconds.
In 360 seconds the machine will make 360*2.5 = 900 copies..

Answer is A

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A certain photocopying machine can make 10 copies every 4 seconds. At 03 Jul 2020, 04:54
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Bunuel
A certain photocopying machine can make 10 copies every 4 seconds. At this rate, how many copies can the machine make in 6 minutes?

(A) 900
(B) 600
(C) 360
(D) 240
(E) 15O
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4 seconds= 10 copies
1 second = \(\frac{10}{4}\) copies

no. of copies in 6 minutes = 6*60=360 seconds

=360*\(\frac{10}{4}\)
=900 copies

IMO A
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A certain photocopying machine can make 10 copies every 4 seconds. At 03 Jul 2020, 04:59
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Explanation:

6 minutes = 360 seconds
4 seconds = 10 copies
360 seconds = 360/4 x 10 = 90x10 = 900

IMO-A
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A certain photocopying machine can make 10 copies every 4 seconds. At 03 Jul 2020, 05:04
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A certain photocopying machines makes 10 copies in 4 seconds, How many copies can they make in 6 minutes ?

1 min is 60 secs, so 6 mins is 360 secs.
10 copies in 4 seconds,
How many copies in 360 seconds ?

(360*10)/4 = 900.
Answer is A.
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A certain photocopying machine can make 10 copies every 4 seconds. At 04 Jul 2020, 02:52
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Bunuel
A certain photocopying machine can make 10 copies every 4 seconds. At this rate, how many copies can the machine make in 6 minutes?

(A) 900
(B) 600
(C) 360
(D) 240
(E) 15O
Show more

Solution


    • We know that \(60\) seconds \(= 1\) minute
    • Now, in 4 seconds the photocopying machine is making 10 copies.
      \(⟹\) In (\(4*15 = 60\) seconds or 1 minute) the photocopying machine will make \(10*15\) copies.
      \(⟹\) In 6 minutes the photocopying machine will make \(10*15*6 = 900\) copies.
Thus, the correct answer is Option A.

Alternately,


    • \(60\) seconds \(= 1\) minute
      \(⟹\) \(1\) second \(= \frac{1}{60}\) minute
      \(⟹\) \(4\) seconds \(=\frac{1}{60}*4 = \frac{1}{15}\) minutes.
    • Now, In \(\frac{1}{15}\) minutes the photocopying machine can make 10 copies.
      \(⟹\) So, in \(1\) minute the photocopying machine will make \(10*15\) copies.
      \(⟹\) And in \(6\) minutes the photocopying machine will make \(10*15*6 = 900\) copies.
Thus, the correct answer is Option A.
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