Given that,
Sami has collected 144 rocks
which is 12 times more than Oliwier collected
To find the number of rocks collected by oliwier
let n be the number of rocks Oliwier collect,
From the given, we get that
[tex]12n=144[/tex][tex]n=\frac{144}{12}[/tex][tex]n=12[/tex]The number of rocks oliwier collect is 12
Answer is: 12.