Answer: 20% increase
Step-by-step explanation: It’s out of 100 and you first got 80 and then you got 100. Since it’s out of 100 you could just subtract to numbers ex: 100-80=20. The answer is 20% increase
Answer:
Carlota is not correct
Step-by-step explanation:
A ratio represents relationship between of two or more things.
Ratio of minutes to gallons of water flowing through a garden hose 
Here,

Also,
It's given that an equivalent ratio of minutes to gallons is 
Now,

Therefore,
Carlota is not correct
Explanation:
How many surface has a pyramid?
5 Faces
It has 5 Faces. The 4 Side Faces are Triangles. The Base is a Square.
I believe the answer to this equation would be the answer 10. Work shown below.
Quotient = division
50 / 10 = 5
Minus = subtraction
15 - 5 = 10
Hope this helped you