Answer:
He can grade 1.25 assignments in 1 minute.
Step-by-step explanation:
Because the teacher can grade 25 assignments in 20 minutes, we can dive 25 by 20 to get the constant rate.
So he can grade 1.25 assignments in 1 minute.
The correct answer would be 7. Explaination below
8 + 7 = 15
15 + 3 = 18
18 - 11 = 7
Answer:20cm