Answer:
5 letters
Explanation:
let x = # of packages
x+2 = # of letters
$0.37(x+2) + $0.88x = $4.49
.37x + .74 + .88x = 4.493
1.25x + .74 = 4.49
1.25x = 3.75
x = 3.75/1.25 = 3 = # of packages
# of letters = x+2 = 3+2 = 5
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