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题库 / Prep2007E1-DS-156
A store sells milk in cartons of two sizes, one-half gallon and one-quarter gallon. If the store sold a total of 300 cartons of milk yesterday, how many gallons of milk did it sell yesterday?
(1) Yesterday the store sold 120 one-quarter-gallon cartons of milk.
(2) Yesterday the store sold 90 gallons of milk in one-half-gallon cartons.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
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x*0.5 + y*0.25 and x+y=300.
stat 1 tells us y, and we can figure out x, and therefore total amount of milk
stat 2 tells us x, and we can find y and therefore total amount of milk