Q27:

The total cost of an office dinner was shared equally by k of the n employees who attended the dinner.  What was the total cost of the dinner?

(1)     Each of the k employees who shared the cost of the dinner paid $19.

(2)   If the total cost of the dinner had been shared equally by k + 1 of the n employees who attended the dinner, each of the k + 1 employees would have paid $18.

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.

选C

这道题请教大家, 实在看不懂k是什么东西

thanks a lot

题意：公司聚餐，公司员工总人数为n，出席的人数为k，问餐宴的总额

(1) k名员工，每人支付$19， 即餐宴的总额为19k，不充分

(2) n名员工中，如果有k+1人出席，则每人支付$18，即餐宴的总额为18(k+1)，不充分

(1)+(2): 19k=18(k+1) --> k=18, 代入(1)或(2)都可求得餐宴的总额

所以C