Final answer:
Shelby can pack an additional 7.5 pounds into her suitcase to stay within the 50-pound limit.
Step-by-step explanation:
The student's question is about calculating the additional weight that can be packed into Shelby's suitcase without exceeding a 50 lbs limit. Shelby's suitcase current weight is 42.5 lbs, so we simply subtract this weight from the allowed limit. To find out how many more pounds Shelby can pack, we perform the following calculation:
- Total allowed weight = 50 lbs
- Current suitcase weight = 42.5 lbs
- Additional weight allowed = Total allowed weight - Current suitcase weight
- Additional weight allowed = 50 lbs - 42.5 lbs
- Additional weight allowed = 7.5 lbs
Therefore, Shelby can pack an additional 7.5 pounds into her suitcase and still stay within the 50-pound limit.