If a 12-foot flag pole casts a 4.8-foot shadow, how tall is a flag pole that casts an 8-foot shadow?

20-foot flag

Step-by-step explanation:

12-foot flag casts 4.8-foot shadow,

which also means that:

4.8-foot shadow is casted by a 12-foot flag

Lets start by find the length of the flag that will cast a 1-foot shadow.

4.8-foot shadow > 12-foot flag

1-foot shadow >  12 ÷ 4.8 = 2.5-foot flag

Now we can find the flag that will cast a 8-foot shadow.

1-foot shadow >  2.5-foot flag

8-foot shadow  >  8 x 2.5-foot  = 20-foot flag