Question

rachel is planning to run an average of 6.4 miles over three consecutive days. on the first day, she ran 6.6 miles, and on the second day, she ran 6.5 miles. what is the maximum number of miles rachel can run on the third day without going over the planned average of 6.4 miles per day?
6.55 miles
5.1 miles
6.7 miles
6.1 miles

Explanation:

Step1: Calculate total allowed miles

Total miles = Average × Days = $6.4 \times 3 = 19.2$ miles

Step2: Sum miles of first two days

Sum = $6.6 + 6.5 = 13.1$ miles

Step3: Find third day's maximum miles

Third day miles = Total - Sum = $19.2 - 13.1 = 6.1$ miles

Answer:

6.1 miles