C=0.6n is a straight line so it is proportional.
Answer:
A. 220 feet
B. 220 feet
C. 5 rolls of ribbon
Step-by-step explanation:
Given.
Number of box 
We need
feet of ribbon for each box wrapping.
Each roll of ribbons is 50 feet.
A.
Estimated value of ribbon for 80 boxes.
= Number of box
ribbon for each box




The estimated number of feet of ribbon for 80 boxes is 220 feet.
B. Exact the number of feet of ribbon for 80 boxes is 220 feet.
C.
Number of rolls for wrapping 80 large boxes.
Each roll of ribbon is 50 feet and we are required 220 feet of ribbons.
rolls of ribbon = total required ribbon divided by how much feet in rolls.
rolls of ribbons = 
rolls of ribbons = 
Therefore, the total required rolls for 220 feet of ribbons is 5
450 is 75% of what
This translates to..
450=0.75 x ?
Basically means
450=0.75x
To solve for x you would divide both sides by 0.75
450/0.75=600
0.75/0.75=x
x=600 <--our FINAL answer
You have only two variables X and Y to signify the angles
Together they must equal 90, because its a right triangle and one angle is 90
2X+4=Y
X+Y=90
Solve for Y
Y=90-X
Set the Y's equal to each other
2X+4=90-X
Isolate the X
3X=86
X=~28.66
Y=~61.34

Actually Welcome to the Concept of the ratio and percentages.
let's be the total kalguksu soup quantity be x
hence, 60% of x = 24 cups, so we get as
===> 60/100 * x = 24
=> 0.6*x = 24
hence, x ==> 24/0.6
=====> x = 40 cups
hence the answer is 40 cups are in total kalguksu soup.