| Difficulty | Secondary School | High school/other |
| ★ | Basic | Easy |
| ★★ | Demanding | Basic |
| ★★★ | Demanding | |
| ★★★★ | Difficult | |
| ★★★★★ | Very difficult |
Determine the highest and lowest temperature of the day and also temperature at the moment of measurement.
Answer: $t_{highest}=38\ °C$
$t_{lowest}=23\ °C$
$t_{at\ the\ time\ of\ measurement}=27\ °C$
$t_{lowest}=23\ °C$
$t_{at\ the\ time\ of\ measurement}=27\ °C$