GMAT Data Sufficiency
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Source: PREP
Level: 0
At a certain pet shop,
of the pets are dogs and 
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.
- 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.