Create a word problem in which you will use the system of equations to solve for the answer.

Amy is starting a bake sale. She sells Cookies for $5 dollars each and cupcakes for $2 each. Karen is also starting a bake sale. She only sells cookies , but for 7.50 each. If Amy gets 50 costumers for cookies and 20 for cupcakes , and Karen gets 70 for cookies , who will make more money?

Hey there!
Here it is:
How many liters of a 20% butterfat milk and a 65% butterfat milk must be mixed to obtain 23 liters of a 85% butterfat milk?
Hope this helps!

k = 3

Step-by-step explanation:

Given that b varies jointly with c and d and inversely with f then the equation relating them is

b = ← k is the constant of variation

To find k use the condition c = 4, d = 9, f = 6 , b = 18, then

18 = = = 6k ( divide both sides by 6 )

3 = k