alimad wrote:
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 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 separate 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.
(A) - reiterates the stimulus
(B) - information is irrelevant to the discussion
(C) - additional information to the stimulus - not helpful in addressing the issue at hand
(D) - stating that if an oven don't have a clock will not install one so - these ovens most likely to be less expensive than the oven's with the build in clocks. - tempting answer
(E) - Additional information to the stimulus - Not quite relevant.
I don't have the OA but I'm going with D. Wait for your responses. Gracias.
D is correct answer.
Households
whose microwave oven does not have a built-in clock are no more likely to have a
separate electric clock plugged in than
households whose microwave oven has one.D states that This microwave has no electric clock. This electric clock needs electricity to run. Therefore, as this microwave has no electric clock, it will consume less electricity than those with microwave.
Assumption: Households whose microwave oven does not have a built-in clock are no more likely to have a separate electric clock plugged in than households whose microwave oven has one.
Conclusion: Therefore, households whose microwave oven has no built-in clock use 45 kilowatt-hours per year less, on average, than do comparable households microwave oven is otherwise similar but has a built-in clock.