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If you fill up 1st conatiner completely and then pour it into third container, filling it completely, you will have 4 gallons left in first container...........reminds me of Bruce Willis n Sam Jackson in Diehard movie, doing the same thing
Even if we assume that the smallest container contains 0.0001 gallon
we can still measure exactly 4 gallons.
S = 0.0001
M = S+2 = 2.0001
B = M+2 = 4.0001 gallons
1. First fill the container M completely.
2. The pour water from this container to the smallest container
Here you have exactly 2 gallons left in the M container.
3. Now pour this water onto container B. It now contains 2 gallons
4. Now pour back the water from S to M. Now M contains 0.0001 Gallons
5. Fill the M container with more water. Now M contains 2.0001 gallons
6. Pour water from M to S and now M contains exactly 2 gallons.
7. Now pour water from M to B. Now B contains 4 gallons.
So the answer in ur case is C where u are making use of both the statements.
I am sure my assumptions are not valid in GMAT. But if i could use any of them the answer would be D.
Ans has to be C in my opinion. You need to empty the second container completely to get exactly 4 gallons. If the third container is smaller than both the second container, you cannot empty the second container fully. So you need to have more information than just 1. 2 provides such information although the amount by which 2nd container is larger than the 3rd is unnecessary.