Question

Charlene is training for a marathon. She runs 5 kilometers per day for 5 days each week. If K stands for the total number of kilometers she runs and W stands for the number of weeks she trains, which equation can be used to find the number of kilometers she has run?

A.
W = 25K

B.
K = 25W

C.
W = 5K

D.
K = 5W

Answer 1

To find the total number of kilometers Charlene runs, you need to consider both the distance she runs each day and the number of days she runs each week.

Charlene runs 5 kilometers each day for 5 days a week, so in one week, she runs:

\[
\text{Total kilometers in one week} = 5 \text{ km/day} \times 5 \text{ days/week} = 25 \text{ km/week}
\]

If \( W \) represents the number of weeks she trains, the total distance \( K \) that she runs after \( W \) weeks can be expressed as:

\[
K = 25W
\]

Thus, the correct equation to find the number of kilometers she has run is:

**B. K = 25W**