Step-by-step explanation:
If each day he increases his practice time by 20 mins then after 25 days his total practice time would be increased by 25*20 mins which is 500 mins then you add the first 40 mins you get 540. The you can figuire out the rest from there.
Is there an image that may help?
Answer:
i dont know i just need points for more questions sorry
..