AlgebraMediumGreatest average daily use within a remaining allowance
Algebra practice question
A phone plan includes 6 gigabytes of data per 30-day month. After 20 days, a customer has used 4 gigabytes. What is the greatest average number of gigabytes per day the customer can use over the remaining days without exceeding the allowance?
Answer: 0.2 or 1/5
2 gigabytes remain for 10 days: 2 ÷ 10 = 0.2 per day.
Common wrong answers
- If you answered 0.3
- 0.3 comes from 6 ÷ 20, ignoring what has been used.
- If you answered 0.6
- 0.6 comes from 6 ÷ 10.
- If you answered 0.1
- 0.1 halves the correct rate.
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