1. Calculate the value of the numerical expression:

$$
2025+720:(72-9 \cdot 7)-(4 \cdot 6-6) \cdot 5+1
$$
1. \(2025+720:(72-9 \cdot 7)-(4 \cdot 6-6) \cdot 5+1=\)
\(=2025+720:(72-63)-(24-6) \cdot 5+1 \quad 2\) BODA
\(=2025+720: 9-18 \cdot 5+1 \quad 1\) BOD
\(=2025+80-90+1 \quad 1\) BOD
\(=2105-90+1 \quad 1\) BOD
\(=2016 \quad 1\) BOD
```

TOTAL 6 POINTS

Note: If the student correctly determined only the value of the expression \(72-9 \cdot 7\), 2 points are awarded. If the student correctly determined only the value of the expression \(4 \cdot 6-6\), 1 point is awarded. \(\begin{array}{lr}\text { 2. Since one day has } 24 \text { hours and } 2000=24 \cdot 83+8, & 1 \text { POINT } \\ \text { we conclude that Ivan's birthday was } 83 \text { days and } 8 \text { hours ago. } & 1 \text { POINT } \\ \text { December has } 31 \text { days, and November has } 30 \text { days, which is a total of } 61 \text { days. } & 1 \text { POINT } \\ \text { From October 31 at } 24 \text { hours, we need to "subtract" } 22 \text { days and } 8 \text { hours. } & 1 \text { POINT } \\ \text { Therefore, Ivan was born on October 9 at } 16 \text { hours. } & 1 \text { POINT } \\ \text { Since Ivan turned } 12 \text { years old in 2015, we conclude that Ivan was born on October 9, 2003, } \\ \text { at 16 hours. } & 1 \text { POINT }\end{array}\)

TOTAL 6 POINTS

Note: If the student (with correct explanations) determined the correct date (and year) but not the time of Ivan's birth, the solution is scored with 5 points.