Answer:
4:9
Explanation:
You already know the number of minutes he lifted weights which is 20 minutes, based on the question. Now, we just have to find the total number of minutes to his entire workout.
Total minutes to entire workout = 20 + 25
= 45 minutes
Number of minutes he lifted weights : Total number of minutes of his workout
20 : 45
4 : 9
(You can further simplify the ratio by dividing 20 and 45 by 5)