Question

Jay runs 8 miles in his first week of training, 10 miles in his second week, 15 in his third, and 16 in his fourth. How many miles does Jay have to run in the fifth week to have an average of 12 miles per week?

A) 11
B) 12
C) 13
D) 14

Answer 1

Jay needs to run 11 miles in the fifth week to achieve an average of 12 miles per week, considering he has already run 49 miles in the first four weeks.

Step-by-step explanation:

To find out how many miles Jay has to run in the fifth week to have an average of 12 miles per week, we first need to calculate the total number of miles he would need to run over the five weeks to achieve this average. The formula to find the total number of miles is average miles per week × number of weeks. In this case, it would be 12 miles/week × 5 weeks = 60 miles total.

Now, we sum the miles run in the first four weeks: 8 + 10 + 15 + 16 = 49 miles. To reach the total of 60 miles, Jay needs to run the difference between 60 miles and the 49 miles already run. That is, 60 - 49 = 11 miles in the fifth week.

Therefore, the correct answer is A) 11 miles.