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题库 / Prep2007E2-DS-181
Rasheed bought two kinds of candy bars, chocolate and toffee, that came in packages of 2 bars each. He handed out ~$\frac{2}{3}$~ of the chocolate bars and ~$\frac{3}{5}$~ of the toffee bars. How many packages of chocolate bars did Rasheed buy?
(1) Rasheed bought 1 fewer package of chocolate bars than toffee bars.
(2) Rasheed handed out the same number of each kind of candy bar.
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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2只能求c和t的比例，题问的是数量
“c和t分装：1包2块。问：买了多少包c？=求x?” 设买c共X包，t共y包
已知：total c=2/3*2x
total t=3/5*2y
1）x=y-1 不知道c、t总量关系，单独不充分
2）c、t总量相等，不知道x、y关系，单独不充分
1）+2）充分
1) C + 1 = T (Insufficient)
2) 2/6 C = 3/10 T --> 20/18 = T/C --> 10/9 = T/C (Insufficient)
C) 10/9 = C+1/C --> 10C = 9C + 9 --> C = 9 (Sufficient)