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GMAT Club World Cup 2026 (Day 10): Kara owns a salt-water aquarium in

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topgmat25

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18 Jul 2026, 07:25

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A The honeymoon started at minimum salinity, giving it a bigger safety buffer.

B Kara already limits her conclusion to a trip that is not extended.

C It discusses the consequences of adding water, not of waiting to add it.

D Moving to a desert makes the comparison with the honeymoon less reliable.

E Correct answer. Removing some salt from the water through crystallization makes the tank more likely to remain within the safe range.

The answer is E

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18 Jul 2026, 07:27

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Kara wants to leave the aquarium unattended for 1 week business trip. It is also mentioned that she has previously left the aquarium unattended for 9 days and the salt level increased but it was safe for the fish.

Question wants strengthening argument

Option A = This indicates that cara needs to take additional steps to prevent increase in salt level and hence does not strengthen the argument
Option B = This option does not talk about the aquarium and hence is not correct
Option C = This option weakens the argument and hence is false
Option D = This option also weakens the argument and hence is false
Option E = This strengthens the argument and hence is the correct answer

Option E

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The answer is E.

(A) This is the opposite. Incorrect.
(B) We are not talking about whether how many planned business trips Kara has worked with. Irrelevant and out-of-scope. Eliminate.
(C) The replenishment of large amount of water means the salinity levels will not remain in the safer zone. Irrelevant, Incorrect.
(D) If Kara moves to the desert region, the evaporation will increase. Weakening the argument - because we all know if there is less water, there is a high chance of salt becoming concentrated. Incorrect.
(E) Although here the evaporation takes place, it will not be as high as in the desert region. That means, Kara can leave the tank unattended for dissolving the water. Answer

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A. Correct- adding additional water to the tank ensures that after the business trip, any evaporation that occurs still keeps salinity levels at a safe level.

B. Incorrect- past duration of business trips has no bearing on this one, it's possible that this one can be the exception and take longer

C. Incorrect- Fish undergoing stress due to changes in salinity only weakens the conclusion

D. Incorrect- Moving to a desert region would increase evaporation of the water in the tank and bring the salinity levels to an unsafe range even faster

E. Incorrect- The salt collecting and crystalizing has no bearing on the conclusion suggested.

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A. Elimiate. The honeymoon opened with the considerably lower salinity making more adequate space before critical values.

B. Weakening. The focus is on the matter of extending the trip rather than on the salinity levels of the aquarium.

C. The issue of stress of water refill is also discussed but is irrelevant in the case as Kara is not going to refill it on this trip. Wrong.

D. The desert climate provides for fast evaporation hence higher salinity levels. I don't think this is correct.

E. Strengthening/It was mentioned that if crystallized salt occupies walls of the tank, salinity will rise slower as compared to the honeymoon period.

I think the correct answer is E

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A This weakens because it means the honeymoon wasn't a fair test.

B She already said the trip won't be extended.

C This is about adding water, not leaving it alone.

D It makes evaporation faster, which weakens the argument.

E Best option. If salt crystallizes on the tank walls instead of staying in the water, the salinity won't rise as fast, making the trip safer than the honeymoon was.

The correct answer is E

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A. This weakens the argument.
B. Irrelevant
C. About fish stress. Irrelevant
D. If water evaporates more fastly then salinity will increase more fastly. This weakens argument.
E. When water evaporates, salts crystallises rather than staying dissolved in water. If salt crystallises on walls of aquarium then there will be less salt in the water. It will become saline slowly. Strengthens the argument. CORRECT

E

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18 Jul 2026, 07:52

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This requires us to understand the Premise and Conclusion correctly in the Pre-thinking before moving forward:

Argument: Kara concludes she can leave the tank unattended because she did so before when she went on her 9-day honeymoon
Premise: That salinity levels in the aquarium are required to be maintained. And when they are left unattended, the salinity levels increase. Kara was able to leave it unattended earlier and proposes to do so this time, without adverse effects.

With this - We need to look at factors that strengthen the proposition that water evaporation will not lead to increased salinity that would harm the fish.

Options:
A - Incorrect. If she added a lot of water, then the water would evaporate and increase its salinity. It doesn't give the solution that salinity would still be maintained comfortably with increased evaporation.
B - This is an assumption and cannot be used to predict anything. What if it increases this time? Irrelevant.
C - Trap answer. The trap is in recognizing that if Kara's fishes experience psychological stress when a large amount of water is added, but it doesn't provide any indication that with increased evaporation the salinity may not increase proportionately.
D - Incorrect. This would weaken the proposition.
E - CORRECT. If the salt crystallizes in the imperfections, then they wouldn't mix in the water or dissolve and be left behind during the evaporation. Hence the level of salinity even if the water evaporates wouldn't be as high. Thus, the option correctly correlates between the water level and less impact of salinity, thereby safeguarding the fish.

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IMO ANS is A

A & E close choices but I feel if she put more water then she have time to fill back so that is good option option E could be the reason because it says small crack save salt but I feel A is the correct answr in my opinion I could be worng and other B C D I don;t feel the answer choice thanks!

Bunuel

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.

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Bunuel

This question was provided by GMAT Club
for the GMAT World Cup Competition

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⚠️ Important: GMAT Club does not allow AI-generated posts. AI-generated solutions are not eligible for kudos, and users who post them may face moderation action, including a ban.

We want something that makes the tank less likely to become too salty than it did during the honeymoon.

A. If the salinity started unusually low during the honeymoon, that trip is not a fair comparison.

B. Supports the idea that the trip won't be extended, but it doesn't say anything about salinity. Incorrect.

C. Talks about stress from refilling water, which isn't the issue here.

D. Weakens. Faster evaporation means salinity would rise more quickly.

E. Correct. If some salt now crystallizes on the tank walls instead of remaining dissolved in the water, less salt stays in the water as evaporation occurs. That means salinity rises more slowly than before, making the tank even safer to leave unattended.

Option E