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题库 / Prep2007E1-DS-140
At a certain pet shop, ~$\frac{1}{3}$~ of the pets are dogs and ~$\frac{1}{5}$~ of the pets are birds. How many of the pets are dogs?
(1) There are 30 birds at the pet shop.
(2) There are 20 more dogs than birds at the pet shop.
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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