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County building inspectors report that almost fifty percent

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County building inspectors report that almost fifty percent  [#permalink]

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New post 25 Apr 2017, 09:17
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County building inspectors report that almost fifty percent of the homes they inspect are equipped with gauges that monitor carbon monoxide levels. Fifteen years ago, only twenty-five percent of inspected homes were equipped with these gauges. However, even though more homes are now monitored for poisonous carbon monoxide fumes, the total number of homes with confirmed dangerous fume levels is no higher now than it was fifteen years ago because a large proportion of gauges produce false readings.

Which one of the following assumptions must be made in order for the author to be correct in drawing the conclusion stated in the passage?

(A) Thirty percent of the residential carbon monoxide gauges have been installed within the last fifteen years.
(B) The number of confirmed dangerous fume readings per year in homes with carbon monoxide gauges has increased in recent years.
(C) Not all carbon monoxide gauges report false carbon monoxide fume levels.
(D) The percentage of malfunctioning carbon monoxide gauges has increased in the last fifteen years.
(E) Properly functioning gauges do not, in themselves, decrease the risk that dangerous carbon monoxide fumes will enter people’s homes.

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Re: County building inspectors report that almost fifty percent  [#permalink]

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New post 25 Apr 2017, 16:42
County building inspectors report that almost fifty percent of the homes they inspect are equipped with gauges that monitor carbon monoxide levels. Fifteen years ago, only twenty-five percent of inspected homes were equipped with these gauges. However, even though more homes are now monitored for poisonous carbon monoxide fumes, the total number of homes with confirmed dangerous fume levels is no higher now than it was fifteen years ago because a large proportion of gauges produce false readings.

Which one of the following assumptions must be made in order for the author to be correct in drawing the conclusion stated in the passage?

(A) Thirty percent of the residential carbon monoxide gauges have been installed within the last fifteen years.
(B) The number of confirmed dangerous fume readings per year in homes with carbon monoxide gauges has increased in recent years.
(C) Not all carbon monoxide gauges report false carbon monoxide fume levels.
(D) The percentage of malfunctioning carbon monoxide gauges has increased in the last fifteen years.
(E) Properly functioning gauges do not, in themselves, decrease the risk that dangerous carbon monoxide fumes will enter people’s homes.

Houses with carbon mono oxide detectors currently is 50 percent while the houses with such detectors 15 years ago were 25 percent and even then the number of houses with actual cases has remained the same..that means only one thing that the percentage of detector devices giving false alarm has increased. that is more number of detectors are giving false alarms.
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Re: County building inspectors report that almost fifty percent  [#permalink]

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New post Updated on: 26 Apr 2017, 00:31
IMHO B.
This is an assumptions question.
If we negate B then there is no increase in the number of dangerous fume readings in homes and this will break the conclusion that gauges produce false readings.

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Originally posted by mcmoorthy on 25 Apr 2017, 19:38.
Last edited by mcmoorthy on 26 Apr 2017, 00:31, edited 1 time in total.
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Re: County building inspectors report that almost fifty percent  [#permalink]

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New post 26 Apr 2017, 00:26
didn't understand at all. can anyone help me with a better explanation?...
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Re: County building inspectors report that almost fifty percent  [#permalink]

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New post 26 Apr 2017, 04:56
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County building inspectors report that almost fifty percent of the homes they inspect are equipped with gauges that monitor carbon monoxide levels. Fifteen years ago, only twenty-five percent of inspected homes were equipped with these gauges. However, even though more homes are now monitored for poisonous carbon monoxide fumes, the total number of homes with confirmed dangerous fume levels is no higher now than it was fifteen years ago because a large proportion of gauges produce false readings.


(D) The percentage of malfunctioning carbon monoxide gauges has increased in the last fifteen years.

Let say today 200 homes are examined
50% equipped with gauges that monitor carbon monoxide levels=100

15 years ago
Let say 100 homes inspected(It is given in question stem that more homes are evaluated now than before)
25%quipped with gauges that monitor carbon monoxide levels=25

total number of homes with confirmed dangerous fume levels is almost same
100 ~25
that means 75 out of 100 are malfunctioning carbon monoxide gauges

D is correct
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Re: County building inspectors report that almost fifty percent  [#permalink]

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New post 03 Oct 2017, 09:11
More homes are now monitored for poisonous carbon monoxide fumes - (25% to 50%)

Total number of homes with confirmed dangerous fume levels is no higher now than it was fifteen years ago (2 Homes)
25% Homes - 2 Homes
50% Homes - 2 Homes

---> So % of Homes of with malfunctioning equipment must have increased for the conclusion - the same number of homes that breach level.
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Re: County building inspectors report that almost fifty percent  [#permalink]

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New post 30 Apr 2018, 13:06
The percentage of detector devices giving false alarm has increased. that is, more number of detectors are giving false alarms. D it is
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Re: County building inspectors report that almost fifty percent &nbs [#permalink] 30 Apr 2018, 13:06
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