Answer:
36 feet
Explanation:
You have to figure out the relation for 6 (karl's real height) and 8 (his shadow's length) by dividing 6 by 8, which gets you a 3/4 ratio of shadow to real height. Since we have the house's height, 48/4=12. Multiplying that by 3 gets you 36, therefore his house is 36 feet.