From Grockit blog,
https://grockit.com/blog/gmat/category/g ... fficiency/
Mrs. K's class has 10 students. If the average age of the students is 12, then how many of the students are 12 years of age?
(1) None of the students are younger than 12.
(2) None of the students are older than 12.
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 statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient to answer the question asked, and additional data are needed.
Even if we don't know the answer, we can see that if 1 is sufficient, then 2 must also be sufficient. Answer choices (A) and (B) are eliminated. Means always must be somewhere between the extremes, so if there are no values below 12, then ALL the values must equal 12. Choice (D) is the answer.
Is it not C?!
https://grockit.com/blog/gmat/category/g ... fficiency/
Mrs. K's class has 10 students. If the average age of the students is 12, then how many of the students are 12 years of age?
(1) None of the students are younger than 12.
(2) None of the students are older than 12.
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 statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient to answer the question asked, and additional data are needed.
Even if we don't know the answer, we can see that if 1 is sufficient, then 2 must also be sufficient. Answer choices (A) and (B) are eliminated. Means always must be somewhere between the extremes, so if there are no values below 12, then ALL the values must equal 12. Choice (D) is the answer.
Is it not C?!
