Most household appliances use electricity only when in use. : GMAT Critical Reasoning (CR)
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# Most household appliances use electricity only when in use.

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Most household appliances use electricity only when in use. [#permalink]

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20 Nov 2005, 13:31
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80% (02:39) correct 20% (02:43) wrong based on 8 sessions

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Most household appliances use electricity only when in use. Many microwave ovens, however, have built-in clocks and so use some electricity even when they are not in use. The clocks each consume about 45 kilowatt-hours per year. Therefore, households whose microwave oven has no built-in clock use 45 kilowatt-hours per year less, on average, than do comparable households whose microwave oven is otherwise similar but has a built-in clock.

Which of the following is an assumption on which the argument depends?

A. Households that do not have a microwave oven use less energy per year, on average, than do households that have a microwave oven.
B. Microwave ovens with a built-in clock do not generally cost more to buy than microwave ovens without a built-in clock.
C. All households that have a microwave oven also have either a gas oven or a conventional electric oven.
D. Households whose microwave oven does not have a built-in clock are no more likely to have a separately electric clock plugged in than households whose microwave oven has one.
E. There are more households that have a microwave oven with a built-in clock than there are households that have a microwave oven without a built-in clock.
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20 Nov 2005, 13:59

Author assume that households whose microwave oven has no built-in clock use less power because microwave is the only appliance used as a clock.
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20 Nov 2005, 16:00
TeHCM wrote:

Author assume that households whose microwave oven has no built-in clock use less power because microwave is the only appliance used as a clock.

Agreed. (D).
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21 Nov 2005, 00:39
Using POE, I got D.

What is the OA?
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21 Nov 2005, 01:26
yup got D as well.
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21 Nov 2005, 02:33
clearly D.
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21 Nov 2005, 19:29
One more D.

A, B, C and E: out of scope. Only D is relevent to the argument.
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21 Nov 2005, 19:38
A. not important

B. out of scope

C. All households that have a microwave oven also have either a gas oven or a conventional electric oven.

D. Households whose microwave oven does not have a built-in clock are no more likely to have a separately electric clock plugged in than households whose microwave oven has one.

E. not important

Between C and D, I go with D. D says that another electric clock is plugges in seperately, and if so, the difference would not be 45kwh per year but less.
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21 Nov 2005, 19:40
OA is D
Manager
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21 Nov 2005, 19:41
OA is D
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