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07 Aug 2026, 13:00
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Kara owns a salt-water aquarium in which the level of salinity, or concentration of salt in the water, must be maintained within a narrow range. Salt is left behind in the remaining liquid when water evaporates, so Kara must periodically replenish the water that evaporates from the tank to keep the salinity in range. In considering whether she can leave the tank alone during a week-long business trip, Kara notes that, during her nine-day honeymoon, she left the tank unattended; while its salinity levels did increase, they were still well within the acceptable range when she returned from the trip. Kara concludes that, as long as the business trip is not extended beyond the planned dates, she can leave the tank unattended during the trip without endangering the fish.
Which of the following, if true, most strengthens the argument above?
A. Immediately before leaving for her honeymoon, Kara added an unusually large amount of water to the tank, bringing its salinity levels down to their minimum safe levels.
B. In the nine years during which Kara has worked for her current employer, none of her business trips has been extended beyond the planned end date, and she has returned from several of them earlier than planned.
C. Many of Kara's fish experience significant physiological stress from rapid changes in salinity, such as those that occur when a large amount of water is replenished, even if overall salinity levels remain within the safe range.
D. Since her honeymoon, Kara has moved to a desert region, in which the lack of humidity allows water to evaporate more quickly than in her previous home region.
E. Since Kara's honeymoon, the walls of her aquarium have developed imperfections in which salt collects and crystallizes, rather than staying dissolved in the remaining water, when water evaporates.
Which of the following, if true, most strengthens the argument above?
A. Immediately before leaving for her honeymoon, Kara added an unusually large amount of water to the tank, bringing its salinity levels down to their minimum safe levels.
B. In the nine years during which Kara has worked for her current employer, none of her business trips has been extended beyond the planned end date, and she has returned from several of them earlier than planned.
C. Many of Kara's fish experience significant physiological stress from rapid changes in salinity, such as those that occur when a large amount of water is replenished, even if overall salinity levels remain within the safe range.
D. Since her honeymoon, Kara has moved to a desert region, in which the lack of humidity allows water to evaporate more quickly than in her previous home region.
E. Since Kara's honeymoon, the walls of her aquarium have developed imperfections in which salt collects and crystallizes, rather than staying dissolved in the remaining water, when water evaporates.
07 Aug 2026, 13:00
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Official Solution:
Kara owns a salt-water aquarium in which the level of salinity, or concentration of salt in the water, must be maintained within a narrow range. Salt is left behind in the remaining liquid when water evaporates, so Kara must periodically replenish the water that evaporates from the tank to keep the salinity in range. In considering whether she can leave the tank alone during a week-long business trip, Kara notes that, during her nine-day honeymoon, she left the tank unattended; while its salinity levels did increase, they were still well within the acceptable range when she returned from the trip. Kara concludes that, as long as the business trip is not extended beyond the planned dates, she can leave the tank unattended during the trip without endangering the fish.
Which of the following, if true, most strengthens the argument above?
A. Immediately before leaving for her honeymoon, Kara added an unusually large amount of water to the tank, bringing its salinity levels down to their minimum safe levels.
B. In the nine years during which Kara has worked for her current employer, none of her business trips has been extended beyond the planned end date, and she has returned from several of them earlier than planned.
C. Many of Kara's fish experience significant physiological stress from rapid changes in salinity, such as those that occur when a large amount of water is replenished, even if overall salinity levels remain within the safe range.
D. Since her honeymoon, Kara has moved to a desert region, in which the lack of humidity allows water to evaporate more quickly than in her previous home region.
E. Since Kara's honeymoon, the walls of her aquarium have developed imperfections in which salt collects and crystallizes, rather than staying dissolved in the remaining water, when water evaporates.
When the water in Kara’s fish tank evaporates, the corresponding quantity of salt doesn't, and so the concentration of salt gradually rises. Since Kara left the tank unattended during her 9-day honeymoon without incident, she argues that she will be able to do the same for a 7-day business trip (with at least two extra days to spare).
We are not told of any other factors that may endanger the fish, so salinity is the only threat as far as this argument is concerned. The only feasible way to strengthen the argument, therefore, is to introduce an external fact that points to the salinity increasing EVEN MORE SLOWLY than we already expect it to by default.
Let’s scan the answer choices for that.
(A) According to this statement, Kara took an action that would maximize the time it would take for the salinity to reach dangerous levels during her honeymoon. This fact may have no net impact on the argument (if Kara does the same thing immediately before leaving again) or it may weaken the argument (if she does not), but there is no way for it to strengthen the argument.
(B) The conclusion of this argument contains “As long as the business trip is not extended beyond the planned dates”. This is a conditional—equivalent to “IF Kara’s business trip is not extended beyond 7 days”—so any possibility of an extended trip is excluded from consideration. The point of this answer choice is to suggest that Kara’s business trip is extremely unlikely to be extended, but that probability is irrelevant to an argument that doesn’t consider those possibilities.
(C) The argument is concerned with consequences of the gradual rise in salinity that will occur while Kara is away. The timeframe of the argument ends at the instant Kara arrives home (within the planned number of days); anything happening after Kara arrives back home is irrelevant.
(D) As described in the passage, salinity rises because of the gradual evaporation of water. If evaporation occurs more quickly than it did before, as this answer choice implies, then the salinity will reach dangerous levels more quickly than it previously did. This choice weakens the argument.
(E) CORRECT: If this statement is true, then evaporation will cause the salinity in the tank to increase more slowly than before the imperfections were present (because salt stuck in the imperfections doesn’t return to the water, and therefore can’t factor into salinity). At the resulting slower rate of increase, it will take more days for the salinity to reach dangerously high levels, so this statement strengthens the argument as required.
Answer: E
Kara owns a salt-water aquarium in which the level of salinity, or concentration of salt in the water, must be maintained within a narrow range. Salt is left behind in the remaining liquid when water evaporates, so Kara must periodically replenish the water that evaporates from the tank to keep the salinity in range. In considering whether she can leave the tank alone during a week-long business trip, Kara notes that, during her nine-day honeymoon, she left the tank unattended; while its salinity levels did increase, they were still well within the acceptable range when she returned from the trip. Kara concludes that, as long as the business trip is not extended beyond the planned dates, she can leave the tank unattended during the trip without endangering the fish.
Which of the following, if true, most strengthens the argument above?
A. Immediately before leaving for her honeymoon, Kara added an unusually large amount of water to the tank, bringing its salinity levels down to their minimum safe levels.
B. In the nine years during which Kara has worked for her current employer, none of her business trips has been extended beyond the planned end date, and she has returned from several of them earlier than planned.
C. Many of Kara's fish experience significant physiological stress from rapid changes in salinity, such as those that occur when a large amount of water is replenished, even if overall salinity levels remain within the safe range.
D. Since her honeymoon, Kara has moved to a desert region, in which the lack of humidity allows water to evaporate more quickly than in her previous home region.
E. Since Kara's honeymoon, the walls of her aquarium have developed imperfections in which salt collects and crystallizes, rather than staying dissolved in the remaining water, when water evaporates.
When the water in Kara’s fish tank evaporates, the corresponding quantity of salt doesn't, and so the concentration of salt gradually rises. Since Kara left the tank unattended during her 9-day honeymoon without incident, she argues that she will be able to do the same for a 7-day business trip (with at least two extra days to spare).
We are not told of any other factors that may endanger the fish, so salinity is the only threat as far as this argument is concerned. The only feasible way to strengthen the argument, therefore, is to introduce an external fact that points to the salinity increasing EVEN MORE SLOWLY than we already expect it to by default.
Let’s scan the answer choices for that.
(A) According to this statement, Kara took an action that would maximize the time it would take for the salinity to reach dangerous levels during her honeymoon. This fact may have no net impact on the argument (if Kara does the same thing immediately before leaving again) or it may weaken the argument (if she does not), but there is no way for it to strengthen the argument.
(B) The conclusion of this argument contains “As long as the business trip is not extended beyond the planned dates”. This is a conditional—equivalent to “IF Kara’s business trip is not extended beyond 7 days”—so any possibility of an extended trip is excluded from consideration. The point of this answer choice is to suggest that Kara’s business trip is extremely unlikely to be extended, but that probability is irrelevant to an argument that doesn’t consider those possibilities.
(C) The argument is concerned with consequences of the gradual rise in salinity that will occur while Kara is away. The timeframe of the argument ends at the instant Kara arrives home (within the planned number of days); anything happening after Kara arrives back home is irrelevant.
(D) As described in the passage, salinity rises because of the gradual evaporation of water. If evaporation occurs more quickly than it did before, as this answer choice implies, then the salinity will reach dangerous levels more quickly than it previously did. This choice weakens the argument.
(E) CORRECT: If this statement is true, then evaporation will cause the salinity in the tank to increase more slowly than before the imperfections were present (because salt stuck in the imperfections doesn’t return to the water, and therefore can’t factor into salinity). At the resulting slower rate of increase, it will take more days for the salinity to reach dangerously high levels, so this statement strengthens the argument as required.
Answer: E
08 Aug 2026, 22:43
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I am still not clear between option A and Option E. Is it option A talks about one time stuff and E talks about repeating stuff and we are sure that will happen again if she will go on trip again.
