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题库 / OG2017Q-DS-215
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.
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.
题目分析：
（1） k个人每人的费用为19美元，由于不知道k的值，不能计算总费用。
（2） k+1个人每人的费用为18美元，由于不知道k的值，不能计算总费用。
结合条件1和条件2，设总费用为x，所以x/19+1=x/18，解得x=18*19=342美元。
因此，本题答案为（C），两个条件结合起来才能解题，任何单独一个均不行。
这道题k of n employee中的n是一个迷惑信息。阅读的时候，要抓住有效信息。
k为未知数
竟然还需要计算出K的值，此值为未知！
(1)T=19*k；
(2)T=18(k+1)；
解出k