Question

Melissa is participating in a 4-day cross-country biking challenge. She biked for 64, 53, and 59 miles on the first three days. How many miles does she need to bike on the last day so that her average (mean) is 60 miles per day?

Answer 1

Answer: 64 miles

Step-by-step explanation:
The total distance Melissa needs to bike over the four days to have an average of 60 miles per day is:

4 days × 60 miles per day = 240 miles

The distance Melissa has already biked in the first three days is:

64 miles + 53 miles + 59 miles = 176 miles

Therefore, Melissa needs to bike:

240 miles - 176 miles = 64 miles

So, Melissa needs to bike 64 miles on the last day to have an average of 60 miles per day over the 4-day biking challenge.