## Task 4

Ursel is tidying up her desk. She finds notebooks from the previous school year.

On one page, not all the digits and arithmetic signs are clearly visible anymore. She tries to figure out what the problems used to be.

$$
2 \star+\star 0=54 \quad ; \quad 7 \cdot \star=1 \star
$$
$24+30=54 ; 7 \cdot 2=14$

### 11.2.2 Round 1965, Class 2