$88.50 you just add btw.just letting u know
If I’m correct the area is 48
Set up a proportion like this

=
So your proportion would be:

We put x for offices because they are asking for the number o offices a crew can paint in 12 hours, and also we don't know the number of offices they can paint in 12 hours
so we cross multiply and we get
6x=60, we got 60 by multiplying 12 and 5
Now we divide both sides by 6 and we get
x=10
S the crew can paint 10 offices in 12 hours.
If the question is referring to the least common multiple it is 24
No its not, the equation your showing right now adds up to 68