請教PREP1 DS數學

[eric5390]

How many of the 42 people in a group are employed students?
1. 29 of the 42 people are employed
2. 24 of the 42 people are students

這題答案給E
但這2個條件知道以後，不就求的出來employed students是11個人了嗎?我一定是那裡錯了，麻煩大大指導一下 謝謝

[eric5390]

剛發現這題有人問過了，不好意思