400-1816-180
本題由chris提供
When 200 gallons of oil were removed from a tank,
(1)Before the 200 gallons were removed, the volume of oil in the tank was 1/2 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 statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.
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已知 移?
（1）沒(méi)有移走前，oil的體積是全部體積的1/2 所以200=（1/2-3/7）V V=2800加侖 充分
（2）移走后，剩下的體積比總體積少1600加侖，所以（V-1600）/V=3/7 V=2800加侖 充分 所以選D
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