Question

jay is training for a marathon. on monday he ran 6 miles. on tuesday he ran 6 miles. on wednesday he ran 6 miles. on thursday he ran 8 miles. if jay wants to average 7 miles a day for the weekdays, how far must he run on friday, since he doesnt run on weekends? distance miles

Explanation:

Step1: Calculate total miles needed

The formula for average is $\text{Average}=\frac{\text{Sum of values}}{\text{Number of values}}$. Here, the average is $7$ miles per day and the number of weekdays (Monday - Friday) is $5$. So the total miles needed for the week is $7\times5 = 35$ miles.

Step2: Calculate miles already run

Jay ran $6 + 6+6 + 8=26$ miles from Monday - Thursday.

Step3: Calculate miles needed on Friday

Let $x$ be the miles run on Friday. Then $26 + x=35$. Solving for $x$, we get $x = 35-26=9$ miles.

Answer:

$9$