Question

A blueprint for a house has a scale factor n = 45. A wall in the blueprint is 9 in. What is the length of the actual wall?

Answer 1

You just need to multiply the size by 45.
9 inches x 45 = 405 inches.

Or if you need it in feet and inches:
405 / 12 = 33 remainder 9,
The answer would be 33 feet, 9 inches, or 405 inches.

Hope this helps.

Answer 2

The length of the actual wall is 405 inches or 33.75 feet.

Explanation:

A blueprint for a house has a scale factor n = 45.

We can say a in a blueprint scale factor 1 in. = 45 inches.

A wall in the blueprints is 9 in.

So the length of the actual wall = 45 × 9 = 405 inches.

We usually represent the length of a wall in feet, so we convert 405 inches into feet.

12 inches = 1 feet

405 inches = 405 / 12 = 33.75 feet.

The length of the actual wall is 405 inches or 33.75 feet.