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Data Sufficiency: Yes/No Basic Technique

Has Stock J been purchased by more than 60% of the 4,000 employees in Company J? >(1) Stock J has been purchased by exactly 3,000 employees of Company J. >(2) Company J has 56% more employees than Company K.
Correct. Since the question stem gives you the total number of employees in Company J, you just need the number of those employees that bought Stock J to answer the question. Statement (1) gives you that exact information. You don't need to calculate anything; whatever the answer is (Yes/No), it is definite. So (1) → Yes → Sufficient → AD. Statement (2) alone is totally irrelevant, so (2) Maybe → Insufficient → A.

Incorrect.

Stat.(2) doesn't give any information about how many employees in Company J have purchased Stock J, so you cannot answer the question definitively. **(2) Maybe → Insufficient → ACE**

Incorrect.

Since the question stem gives you the total number of employees in Company J, you just need the number of those employees that bought Stock J to answer the question. Statement (1) gives you that exact information. You don't need to calculate anything; whatever the answer is (Yes/No), it is definite. So (1) → Yes → Sufficient → AD.

Incorrect.

Stat.(2) doesn't give any information about how many employees in Company J have purchased Stock J, so you cannot answer the question definitively. **(2) Maybe → Insufficient → ACE**

Incorrect.

Since the question stem gives you the total number of employees in Company J, you just need the number of those employees that bought Stock J to answer the question. Statement (1) gives you that exact information. You don't need to calculate anything; whatever the answer is (Yes/No), it is definite. So (1) → Yes → Sufficient → AD.
Statement (1) ALONE is sufficient, but Statement (2) alone is not sufficient to answer the question asked.
Statement (2) ALONE is sufficient, but Statement (1) alone is not sufficient to answer the question asked.
BOTH Statements (1) and (2) TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient to answer the question asked.
EACH statement ALONE is sufficient to answer the question asked.
Statements (1) and (2) TOGETHER are NOT sufficient to answer the question asked, and additional data specific to the problem are needed.