Answer:
Carlos = 16
Dan = 64
Karen = 9
Explanation:
Let Carlos be x
Dan = 4x
Karen = x - 7
Their total is 89
Create an equation of Carlos + Dan + Karen = 89
x + 4x + x - 7 = 89
Combine like terms
6x - 7 = 89
Add 7 on both sides to get rid of 7
6x = 96
Isolate x by dividing by 6 on both sides
x = 16
Substitute the amount of orders each person served
Carlos = 16
Dan = 64
Karen = 9
Hope this helps :)
Have a great day!