Question

The rectangular floor of a classroom is 21 feet in length and 30 feet in width. A scale drawing of the floor has a length of 7 inches. What is the perimeter, in inches, of the floor in the scale drawing?

Answer 1

Answer:

The perimeter of the scale floor is 34 inches.

Step-by-step explanation:

To solve, we can set up fractions:

$\frac{21}{7}=\frac{30}{x}$

Cross multiply and you get:

21x = 210

Divide each side by 21:

x = 10

Since you are trying to find the perimeter of the floor, you can use this equation:

2w + 2l = p

Substitute to solve:

2 ( width = 10 )

2 ( length = 7 )

2 ( 7 ) + 2 ( 10 ) = p

14 + 20 = p

34 = p