Three would fit cause 3 times 12 is 36 and 4 times 12 is 48 which would be too big
You should be able to set up a proportion between the sides something like (18+x)/x=(56+21)/56
X = 0 y =-1 because you have to have to find numbers to replace x & y.
Answer:
according to google there are 30 inches in a full step
Step-by-step explanation: