9514 1404 393
Answer:
36
Explanation:
The equation for Ronny's total sales can be written as ...
450 +5x = 630 . . . . . where x is the number of additional mugs to be sold
5x = 180 . . . . . . . subtract 450
x = 36 . . . . . divide by 5
Ronny needs to sell 36 more coffee mugs to reach his sales goal.