I need the answer to this and help on how to figure it out and no it’s not a quiz it’s practice

ANSWER :
The answer is 3
EXPLANATION :
Looking at the last line, we have an 8 and it becomes 24.
Placing 3 to the blank :
[tex]3\cdot8=24[/tex]Same with the second line :
[tex]3\cdot(3+5)=3\cdot8[/tex]