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# If a machine working at a constant rate produces 3,000 golf balls per

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Math Expert
Joined: 02 Sep 2009
Posts: 58316
If a machine working at a constant rate produces 3,000 golf balls per  [#permalink]

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18 Feb 2019, 04:13
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Difficulty:

15% (low)

Question Stats:

74% (01:21) correct 26% (01:37) wrong based on 95 sessions

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If a machine working at a constant rate produces 3,000 golf balls per hour, how many golf balls can four of these machines make in y minutes?

A. 200y
B. 200/y
C. 750y
D. 7500/y
E. 720000/y

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Re: If a machine working at a constant rate produces 3,000 golf balls per  [#permalink]

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18 Feb 2019, 04:37
1
Bunuel wrote:
If a machine working at a constant rate produces 3,000 golf balls per hour, how many golf balls can four of these machines make in y minutes?

A. 200y
B. 200/y
C. 750y
D. 7500/y
E. 720000/y

rate per min = 3000/60 = 50
in y mins 50 * y
and 4 machines 50 * 4* y
200y
IMO A
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Re: If a machine working at a constant rate produces 3,000 golf balls per  [#permalink]

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18 Feb 2019, 05:20
2
one machines makes 3,000 golf balls per hour,
thus in one minute 3000/60 = 50 balls
in y minutes 50y
4 machines in y minutes = 50y*4= 200y
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Re: If a machine working at a constant rate produces 3,000 golf balls per  [#permalink]

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27 Feb 2019, 22:41
Bunuel wrote:
If a machine working at a constant rate produces 3,000 golf balls per hour, how many golf balls can four of these machines make in y minutes?

A. 200y
B. 200/y
C. 750y
D. 7500/y
E. 720000/y

Machine * Time * Rate = Work

4 * 3000/60 * y = Work

200y = Work

Hence A.

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Re: If a machine working at a constant rate produces 3,000 golf balls per  [#permalink]

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17 Mar 2019, 13:01
If M makes 3,000 per hour, it makes 3,000/60 = 50 per minute.
4M would make 200 per minute.
Set y to an easy number like 2, so our target answer is now 400.
Only A fits.
Re: If a machine working at a constant rate produces 3,000 golf balls per   [#permalink] 17 Mar 2019, 13:01
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