GMAT Data Sufficiency
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Source: GWD
Level: 3
When 200 gallons of oil were removed from a tank, the volume of oil left in the tank was 
of the tank's capacity. What was the tank's capacity?
(1)Before the 200 gallons were removed, the volume of oil in the tank was 
of the tank's capacity.
(2)After the 200 gallons were removed, the volume of oil left in the tank was 1,600 gallons less than the tank's capacity.
- A Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
- B Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
- C BOTH statement TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
- D EACH statement ALONE is sufficient.
- E Statements (1) and (2) TOGETHER are NOT sufficient.