@Seraphinaf5 The answer is 71.
Here’s why:
* The room initially has 100 people.
* A man enters, so the total becomes 101.
* 40 people leave, leaving 61.
* 10 people enter, making it 71.
Calculation:
* 100 + 1 − 40 + 10 = 71
Answer: 71 people are still in the room.