Inequality Word Problems
Real-world problems using inequalities
Inequality Word Problems
Key Phrases for Inequalities
| Phrase | Symbol | |--------|--------| | "at least", "minimum", "no less than" | | | "at most", "maximum", "no more than" | | | "more than", "greater than" | | | "less than", "fewer than" | |
Strategy
- Define a variable
- Write an inequality from the problem
- Solve the inequality
- Check if the answer makes sense in context
Common Scenarios
Budget problems: Total cost ≤ available money
Grade problems: Average score ≥ desired grade
Capacity problems: Number of people ≤ maximum capacity
Interpreting Solutions
Remember to consider realistic constraints:
- Can't have negative people
- Can't work negative hours
- Round to whole numbers when appropriate
📚 Practice Problems
1Problem 1easy
❓ Question:
Sarah wants to buy notebooks that cost $3 each. She has $20. What is the maximum number of notebooks she can buy?
💡 Show Solution
Let = number of notebooks
The cost must be at most $20:
Divide by 3:
Since she can't buy a fraction of a notebook:
Answer: Maximum of 6 notebooks
2Problem 2medium
❓ Question:
A taxi charges $5 plus $2 per mile. You have $25. What is the maximum distance you can travel?
💡 Show Solution
Let = miles traveled
Total cost:
This must be at most $25:
Subtract 5:
Divide by 2:
Answer: Maximum distance is 10 miles
3Problem 3hard
❓ Question:
Maria scored 85, 92, and 88 on her first three tests. What must she score on the fourth test to have an average of at least 90?
💡 Show Solution
Let = score on fourth test
Average formula:
Multiply both sides by 4:
Subtract 265:
Answer: She must score at least 95 on the fourth test
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