To solve this problem you must apply the proccedure shown below:
1. You have the following information given in the problem above:
- The house on the plan is 10.5 inches long and 6.5 inches wide.
- The scale used is 0.5 inch=2 ft
2. Therefore, you have:
0.5 inch-------2 feet
10.5 inches--x
x=10.5x2/0.5
x=42 feet
Therefore, the answer is: 42 feet long.