Answer: 40
Step-by-step explanation: 4 x 10 = 40
Given the information, we have a direct proportionality. Then, the proportions would be:

solving for x we get the following:

therefore, to paint 11 rooms, we will need 19 1/4 gallons of paint
I say she is incorrect because the equation 9y+y9y+y should equal 19y if I am correct. I am sorry if im not correct but i believe she is incorrect
Answer:
If the length of each side of a triangle is doubled then its perimeter is also doubled.
To start you would count 140 miles and 90 miles and add that together because they are at least that far apart because they are in different directions with the measurement starting at the airport. So you have 230 miles. Then you would know that plan A is 3 miles up and plane B is only 2 miles up, so there's one more mile between them. So you can add that and say 231 miles.