+1694 Britt can buy 12 complete sets and have $1.40 change in his pocket. 
urvw! I'll explain how I've done it.
cost of 1 pencil = 20 / 40 = 0.50
cost of 1 eraser = 20 / 25 = 0.80
cost of 1 bookmark = 20 / 80 = 0.25
cost of 1 complete set = 0.5 + 0.80 + 0.25 = 1.55
20 / 1.55 ≈ 12.9
+318 Answer: 12 complete sets.
Solution:
1. Find each cost of a pencil, eraser, and bookmark.
Pencil = 0.5 ($20 / 40)
Eraser = 0.8 ($20 / 25)
Bookmark = 0.25 ($20 / 80)
2. Find cost of a complete set (x) by adding each costs.
x = 0.5 + 0.8 + 0.25
x = 1.55
So:
number of complete sets = 20 / 1.55
= 12.90
Since .90 is not whole, only 12 is considered.
Hope this helps!
