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# A rotameter is a device that measures flow of liquid and gases. When

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Math Expert
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A rotameter is a device that measures flow of liquid and gases. When  [#permalink]

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29 Jun 2016, 06:56
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77% (02:16) correct 23% (02:36) wrong based on 19 sessions

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A rotameter is a device that measures flow of liquid and gases. When measuring liquid phase flows, 2.5 inches represent 60 liters per minute of liquid. With gas measurements the rotameter moves 50% of the movement he moves with the liquid phase. How many liters of gas passed through the rotameter if it measured 4 inches?

A. 176
B. 192
C. 202
D. 218
E. 284

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A rotameter is a device that measures flow of liquid and gases. When  [#permalink]

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29 Jun 2016, 07:38
for gas: 1.25 (half of 2.5) = 60 ltrs/min

1.25 = 5/4

So, if rotameter measured 4 inches:

1.25/4 = 60/x ---> x = 60*4/1.25 ---> x = 60*4*4/5 ---> x = 12*4*4 = 192 litres/min

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A rotameter is a device that measures flow of liquid and gases. When  [#permalink]

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Updated on: 29 Jun 2016, 22:14
Bunuel wrote:
A rotameter is a device that measures flow of liquid and gases. When measuring liquid phase flows, 2.5 inches represent 60 liters per minute of liquid. With gas measurements the rotameter moves 50% of the movement he moves with the liquid phase. How many liters of gas passed through the rotameter if it measured 4 inches?

A. 176
B. 192
C. 202
D. 218
E. 284

IN LIQUID
2.5 INCH = 60

IN GAS
2.5 INCH * 50% = 60
2.5 INCH * 0.5 = 60
so
4 INCH = 4 *$$\frac{60}{0.5 * 2.5}$$
==> $$\frac{240}{1.25}$$ ===> 192
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Originally posted by LogicGuru1 on 29 Jun 2016, 08:20.
Last edited by LogicGuru1 on 29 Jun 2016, 22:14, edited 1 time in total.
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Re: A rotameter is a device that measures flow of liquid and gases. When  [#permalink]

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29 Jun 2016, 08:37
Bunuel wrote:
A rotameter is a device that measures flow of liquid and gases. When measuring liquid phase flows, 2.5 inches represent 60 liters per minute of liquid. With gas measurements the rotameter moves 50% of the movement he moves with the liquid phase. How many liters of gas passed through the rotameter if it measured 4 inches?

A. 176
B. 192
C. 202
D. 218
E. 284

In case of liquid- 2.5 inches represents 60 lit/min.

In case of gas- 50% of 2.5 inches represents 60 lit/min

1.25 inches represents 60 lit /min

4 inches will represent 60*4/1.25= 192

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Re: A rotameter is a device that measures flow of liquid and gases. When  [#permalink]

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29 Jun 2016, 22:09
Bunuel wrote:
A rotameter is a device that measures flow of liquid and gases. When measuring liquid phase flows, 2.5 inches represent 60 liters per minute of liquid. With gas measurements the rotameter moves 50% of the movement he moves with the liquid phase. How many liters of gas passed through the rotameter if it measured 4 inches?

A. 176
B. 192
C. 202
D. 218
E. 284

2.5/2=1.25 inches for 60 litres
then 4 inches will give us how many litres?

4*60/1.25=192 litres

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Re: A rotameter is a device that measures flow of liquid and gases. When  [#permalink]

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04 Jul 2016, 01:52
(4/2.5 )*2*60=192 B

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Re: A rotameter is a device that measures flow of liquid and gases. When   [#permalink] 04 Jul 2016, 01:52