# Question 85352

Oct 25, 2016

$21.25 \text{ ft}$

#### Explanation:

This is a unit cancellation problem. Bear in mind that when we write $\text{in}$ we are referring to the blueprint and when we write $\text{ft}$ we are referring to the actual house. If it is confusing saying two different lengths are equal, you can think of them as "blueprint inches" vs "real feet."

$2 \text{ in" = 5" ft}$

$\implies \left(5 \text{ ft")/(2" in}\right) = 1$

8.5cancel(" in")xx(5" ft")/(2cancel(" in"))#

$= \frac{8.5 \times 5}{2} \text{ ft}$

$= 21.25 \text{ ft}$