Bunuel wrote:

How many kiloliters of water are in a reservoir?

(1) If the reservoir were filled to capacity, there would be 430 more kiloliters in the reservoir.

(2) The reservoir is normally 65 percent full.

Target question: How many kiloliters of water are in a reservoir? Statement 1: If the reservoir were filled to capacity, there would be 430 more kiloliters in the reservoir. So, currently, there are 430 kiloliters of EMPTY SPACE in the reservoir.

Since, we have no idea of how much water is currently in the reservoir,

we cannot determine the TOTAL volume of water in the reservoir.

Since we cannot answer the

target question with certainty, statement 1 is NOT SUFFICIENT

Statement 2: The reservoir is normally 65 percent full Knowing the PROPORTION of water in the reservoir cannot help determine

the TOTAL volume of water in the reservoir.

Since we cannot answer the

target question with certainty, statement 2 is NOT SUFFICIENT

Statements 1 and 2 combined Statement 2 says, "The reservoir is

normally 65 percent full"

This statement has some problematic wording that affects the two statements combined.

Does this mean that the reservoir is CURRENTLY 65 percent full? Not really.

If we don't know what percent of the reservoir is CURRENTLY full, then the combined statements are NOT SUFFICIENT, and the answer is E

If we are saying that the reservoir is CURRENTLY 65 percent full, then we know that 35% of the reservoir is EMPTY SPACE.

Statement 1 tells us that there are 430 kiloliters of EMPTY SPACE in the reservoir.

So, 35% of the total volume = 430

In other words, 0.35(total volume) = 430

Since we COULD solve this equation, we COULD determine

the TOTAL volume of water in the reservoir,

the Since we can answer the

target question with certainty, the combined statements are SUFFICIENT in which case the combined statements are SUFFICIENT, and the answer is C

Cheers,

Brent

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Brent Hanneson – Founder of gmatprepnow.com