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A certain plastic cup is manufactured by a robot. If 5 such robots, wo

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A certain plastic cup is manufactured by a robot. If 5 such robots, wo  [#permalink]

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New post 18 Sep 2018, 20:25
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A certain plastic cup is manufactured by a robot. If 5 such robots, working at the same individual rate, can manufacture a combined total of 5 cups in 5 seconds, how many seconds will it take 25 robots to manufacture a total of 25 cups?

A) 25
B) 20
C) 15
D) 10
E) 5

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Re: A certain plastic cup is manufactured by a robot. If 5 such robots, wo  [#permalink]

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New post 18 Sep 2018, 21:03
I think the answer should be 5 seconds.

Each robot takes 5 seconds per cup.
i.e if rate of each robot is R in cups per second
We get 5R *5 = 5 or we Get 1 cup per 5 second


Thus 25 robots working on 25 cups will take 25/(25*(1/5)) seconds i.e. 5 seconds

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Re: A certain plastic cup is manufactured by a robot. If 5 such robots, wo  [#permalink]

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New post 23 Sep 2018, 15:28
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Bunuel wrote:
A certain plastic cup is manufactured by a robot. If 5 such robots, working at the same individual rate, can manufacture a combined total of 5 cups in 5 seconds, how many seconds will it take 25 robots to manufacture a total of 25 cups?

A) 25
B) 20
C) 15
D) 10
E) 5


The rate of 5 robots is 5/5 = 1. So the rate of 25 robots is 5. So it will take 25 robots 25/5 = 5 seconds to manufacture 25 cups.

Answer: E
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Re: A certain plastic cup is manufactured by a robot. If 5 such robots, wo  [#permalink]

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New post 25 Sep 2018, 13:20
5 robs take 5 secs
this means, 1 rob will take 5 x 5 : 25 secs
thus 25 robs will take 25/25 : 1 sec
since it takes 1sec to produce 5 cups, to produce 25 cups: 25/5: 5 seconds.
E

i wonder if we can solve these questions using the ratios:

robs : Time : Qty
5 : 5 : 5
25 : ? : 25

any one?
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Re: A certain plastic cup is manufactured by a robot. If 5 such robots, wo &nbs [#permalink] 25 Sep 2018, 13:20
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