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A machine at the golf ball factory can produce 16 golf balls

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by AAPL » Mon Aug 13, 2018 5:36 am

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Source: Princeton Review

A machine at the golf ball factory can produce 16 golf balls in 5 minutes. If several of these machines work independently and each machine performs at the same rate, how many machines are needed to produce 32 golf balls per minute?

A. 3
B. 6
C. 8
D. 10
E. 13

The OA is D.
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by Brent@GMATPrepNow » Mon Aug 13, 2018 6:28 am
AAPL wrote:Source: Princeton Review

A machine at the golf ball factory can produce 16 golf balls in 5 minutes. If several of these machines work independently and each machine performs at the same rate, how many machines are needed to produce 32 golf balls per minute?

A. 3
B. 6
C. 8
D. 10
E. 13
Let's answer the question in steps...

GIVEN: 1 machine produces 16 golf balls in 5 minutes.
So, 1 machine produces 16/5 golf balls in 1 minute [if we have 1/5 the time, then the output is 1/5 as much]
So, 5 machines produce 16 golf balls in 1 minute [if we have 5 times the number of machines, then the output is 5 times as much]
So, 10 machines produce 32 golf balls in 1 minute [if we double the number of machines, then the output is doubled]

Answer: D

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Brent
Brent Hanneson - Creator of GMATPrepNow.com
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by Jeff@TargetTestPrep » Sat Aug 18, 2018 6:43 pm
AAPL wrote:Source: Princeton Review

A machine at the golf ball factory can produce 16 golf balls in 5 minutes. If several of these machines work independently and each machine performs at the same rate, how many machines are needed to produce 32 golf balls per minute?

A. 3
B. 6
C. 8
D. 10
E. 13
The rate of a machine is 16/5 = 3.2 golf balls per minute. We see that to produce 32 golf balls per minutes, we need 10 machines, since 10 x 3.2 = 32.

Answer: D

Jeffrey Miller
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