Answer:
18 + 1.25s = 26.75
Explanation:
Given :
Cost of empty stamp = $18
Cost per collectible stamp = $1.25
Total amount spent = $26.75
Number of collectible stamps = s
Equation to represent the number of stamps purchased :
Total amount spent = (number of empty stamp*cost of empty stamp) + (number of collectible stamps * cost per collectible stamp)
26.75 = (1 * 18) + (1.25 * s)
18 + 1.25s = 26.75
1.25s = 26.75 - 18
1.25s = 8.75
s = 7