求助GWD-20-9 MATH（未讨论题）

Yesterday Diana spent a total of 240 minutes attending a training class, responding to E-mails, and talking on the phone.  If she did no two of these three activities at the same time, how much time did she spend talking on the phone?

(1)Yesterday the amount of time that Diana spent attending the training class was 90 percent of the amount of time that she spent responding to E-mails.

(2)Yesterday the amount of time that Diana spent attending the training class was 60 percent of the total amount of time that she spent responding to E-mails and talking on the phone.

我也是这么想的

谢谢ls两位，did no two of these three activities 被我看成did  two of these three activities

虽然gmat数学比较简单，但是每次都会因为所谓的粗心错一些，真受不了自己了，这道题因为少看一个no，我花了好多时间想啊