Answer:
18
Explanation:
So if it took 64 days with 12 workers and they want to build a similar building with 48 this js what you would do.
12 workers took 64 days ok
now times that by 2
24 workers now divide the days cause you have 2x the workers
24 workers is 32 days
now do the same thing
times 2 workers divided 2 days
48 workers 18 days