Answer:
2/3 or 2:3
Explanation:
If 6 out of 10 students completed the homework then 4 out of 10 students did not complete the homework.
So the answer is 4/6 but we are not done yet.
The 4 comes from people who didn't do it and the 6 comes from people who did.
Since its asking the ratio of students who did not do their homework to those who did the 4 comes first.
As I said we are not done yet since we have to simplify.
4/6=2/3
So the answer is 2/3 or 2:3