Answer:
12 packets of clay
Explanation:
Since the amount of packets is proportional to the weight in pounds, we can determine how many packets (p) Clay must buy for 9 pounds of clay using a proportion:
4/5 lbs / 1 packet of clay = 9 lbs / p packets of clay
(4/5 = 9/p) * p
(4/5p = 9) * 5/4
p = 11.25
p = 12
- We can't have a fraction of a packet, so Clay needs at least 12 packets of clay.
- Buying 12 packets means that Clay will have 9.6 lbs of clay since 4/5 * 12 = 9.6, meaning he'll have just enough for his model and 0.6 lbs left over.