Hey there, and good morning to you! :D
We know that:
-the shower block as an area of 144m^2
-the length of the shower block is 24m
Area= length x width
Plug in the values you know.
144= length*24
Divide both sides by 24.
length=6
The width of the shower block is 6m.
I hope this helps!
~kaikers