Answer:
0
Explanation:
The reason the answer would be 0 is because there is 20 students in all
This equation tells us that 14 students ate pizza and 6 ate burgers
Therefore we would add 14 + 6 to see how many students that is
In this case that is 20 students
If there is only 20 students in the lunchroom then you couldn't add anymore students
So, your answer is 0 students brought lunch from home
Hope this helps!