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In a typical month, 1/2 of the UFO sightings in the state are attribut

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In a typical month, 1/2 of the UFO sightings in the state are attribut  [#permalink]

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New post 08 Jan 2019, 00:55
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Question Stats:

88% (01:03) correct 13% (01:20) wrong based on 19 sessions

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In a typical month, 1/2 of the UFO sightings in the state are attributable to airplanes and 1/3 of the remaining sightings are attributable to weather balloons. If there were 108 UFO sightings during one typical month, how many would be attributable to weather balloons?

A. 18
B. 24
C. 36
D. 54
E. 72

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Re: In a typical month, 1/2 of the UFO sightings in the state are attribut  [#permalink]

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New post 08 Jan 2019, 01:20
Let the UFO sightings be X.
X/2 will be airplanes. Remaining will be X/2
X/6 will be weather balloons.
X = 108
Weather balloons = 108/6 = 18

A is the answer.
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In a typical month, 1/2 of the UFO sightings in the state are attribut  [#permalink]

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New post 08 Jan 2019, 01:59
Bunuel wrote:
In a typical month, 1/2 of the UFO sightings in the state are attributable to airplanes and 1/3 of the remaining sightings are attributable to weather balloons. If there were 108 UFO sightings during one typical month, how many would be attributable to weather balloons?

A. 18
B. 24
C. 36
D. 54
E. 72



i solved using 2x2 matrix

got 18 .. IMO A
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In a typical month, 1/2 of the UFO sightings in the state are attribut   [#permalink] 08 Jan 2019, 01:59
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