No, her answer is not reasonable because one yard is equal to 3 feet.
Answer:
75%
Step-by-step explanation:
20-5=15 - change in numbers
15/20×100%= 75%
First, multiply by 3 on both sides:

Divide by 7:

So,
k = 9
I had this same question yesterday it was c 2x+3x+9x