In the morning the air temperature was -23, in the afternoon it increased by 8

In the morning the air temperature was -23, in the afternoon it increased by 8, and by the evening it dropped by 10. What was the temperature during the day? What evening?

Given:
The temperature in the morning is 23 degrees.
The temperature during the day is 8 degrees higher than in the morning.
The temperature in the evening is 10 degrees lower than during the day.
Daytime temperature -? Temperature in the evening-?
Decision.
1) Let’s calculate what the temperature was during the day.
23 + 8 = 31 degrees.
2) Let’s calculate what the temperature was in the evening.
31-10 = 21 degrees.
Answer: 31 degrees, 21 degrees.