求助！！！

momohere88

Q17:

To be eligible for retirement benefits at the Omega Corporation, the sum of an employee’s age, in years, and the number of years of employment must be at least 70.  If x, where x < 70, is a certain employee’s age when hired and y is the minimum number of years of employment required for the employee to be eligible for retirement benefits, which of the following equations represents the relationship between x and y ?

 

A.    xy = 70

B.     x + y = 70

C.     2x + y = 70

D.    x + 2y = 70

E.     2x + 2y = 70

upinheavenzys

谢谢回复

那个可能是我想复杂了，我想的是唯一性，1<<K, 在 [13!+2 , 13!+13]中有很多可能因子，所以不明白，既然按rachelq5所分析，这题考的实际上是可能性，就明白了

但另一题我实在还是有点糊涂 (确实是8/9 )

x<8/9, 则设它为63/72

y < 1/8,则设它为8/72

x+y 也只能卡在71/72

因为他们是小于这些数，我认为两个相加是不是不应该基于他们所小于的数的基本上呢 ？？

或者是理解的问题