To represent the problem using the equation format \( px + q = r \):
Let \( x \) be the number of weekdays Johan practiced.
- He practiced for 45 minutes on Saturday.
- On weekdays, he practiced for 25 minutes each day.
The total practice time can be expressed as:
\[
25x + 45 = 120
\]
Now, set this equation in the format you requested:
Response areas:
- \( p = 25 \)
- \( x = x \)
- \( q = 45 \)
- \( r = 120 \)
Now the equation can be represented as:
**25x + 45 = 120**