Answer:
72ft.
Explanation:
Could be mis-understanding the problem, but if the man is 6ft tall and having a 4ft shadow, then you want to figure out how many times 4 goes into 48, which signifies how many times taller the tree is compared to the man.
48/4= 12
next you want to multiply 6 by 12, which shows exactly how tall the tree is.
6x12= 72.