Answer:

Step-by-step explanation:
20 1/4 = 20.25
20.25/9 = 2.25
2.25 = 
Each cake weighs 2.25 pounds.
2 Would be your answer if the units are positive.
Answer:
A= ( 5 x 3 ) x [(9-5)x3 divided by 2]
15+6
=21
P= 5+5+3+9
=22
1.5x + 7 = 20.5
First subtract 7 from both sides
1.5x = 13.5
Then divide both sides by 1.5
x = 9
Let me know in comments if you have questions