请教2道gwd数学

看不懂题目，请nn指教

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 ?

 实际年龄+雇佣期>=70就可以得到retirement benefits 。

X是a certain employee’s age when hired ， Y是the minimum number of years of employment

所以实际年龄=X+Y     雇佣期=Y         所以X+2Y=70  

 实际年龄+雇佣期>=70就可以得到retirement benefits 。

X是a certain employee’s age when hired ， Y是the minimum number of years of employment

所以实际年龄=X+Y     雇佣期=Y         所以X+2Y=70  

A.     xy = 70

B.     x + y = 70

C.     2x + y = 70

D.     x + 2y = 70

E.      2x + 2y = 70