Answer:
The answer is 8
Step-by-step explanation:
12*10=120 120/15=8
You get the length and you times it by the width giving you the answer
I really don't know how toowrk it out on paper, I'm afraid. I just looked at it, and somehow knew that the answers are 7 and 9.
There are 9 whole numbers in between 20 and 30
