Answer:
6
Step-by-step explanation:
In 1 hour Kalon by himself can clean 1/4 of a chimney.
In one hour Kalon and Marna together can clean

Therefore in 1 hour Marna working alone can clean

So, it takes Marna 3 hours to clean a chimney, working by herself.
Answer:
Penny needs
cups of flour to make 3/4 of the recipe.
The recipe will make 18 cookies.
Step-by-step explanation:
We have been given that a recipe for oatmeal cookies makes 24 cookies. Penny wants to make 3/4 of the recipe.
To find the number of cookies that will 3/4 of the recipe will make, we need to find 3/4 of 24 as shown below:



Therefore, the recipe will make 18 cookies.
We are also told that recipe calls for 2 1/2 cups of flour. To find amount of flour needed for 3/4 of the recipe, we will multiply 2 1/2 cups by 3/4 as:





Therefore, Penny needs
cups of flour to make 3/4 of the recipe.
-3x -8y = -23
4(7x + 2y = -13)
-3x -8y = -23
28x + 8y = -52
25x = -75
x = -3
-3(-3) - 8y = -23
9 - 8y =-23
32 = 8y
y=4
Answer:64
Step-by-step explanation: because 2 multiplied by 2 is 4 four multiplied by 2 is eight as the pattern continues 32 multiplied by 2 is 64.