The ratio of the pe… - QuestionCove
OpenStudy (anonymous):

The ratio of the perimeters of two rectangles is 5 to 8. The perimeter of the larger rectangle is 72 inches. What is the perimeter of the smaller rectangle? A. 115.2 inches B. 45 inches C. 40 inches D. 16.4 inches

2 years ago
OpenStudy (anonymous):

2 years ago
OpenStudy (anonymous):

@Conqueror

2 years ago
OpenStudy (anonymous):

@iGreen

2 years ago
OpenStudy (igreen):

LOL CROSS MULTIPLY

2 years ago
OpenStudy (anonymous):

how would i set that up?

2 years ago
OpenStudy (anonymous):

$\frac{8}{5}=\frac{x}{72}$ then cross multiply lol

2 years ago
OpenStudy (anonymous):

ok one sec

2 years ago
OpenStudy (igreen):

WHAT. YOU HYPOCRITE.

2 years ago
OpenStudy (anonymous):

just kidding never cross multiply

2 years ago
OpenStudy (anonymous):

$\frac{8}{5}=\frac{x}{72}\iff x=\frac{72\times 8}{5}$

2 years ago
OpenStudy (igreen):

$$\color{blue}{\text{Originally Posted by}}$$ @satellite73 $\frac{8}{5}=\frac{x}{72}$ then cross multiply lol $$\color{blue}{\text{End of Quote}}$$ This is how you set it up. Cross multiplying gives us: 8 * 72 = 5 * x

2 years ago
OpenStudy (anonymous):

oh

2 years ago
OpenStudy (anonymous):

avoid cross multiplying whenever possible why multiply and then undo it by division?

2 years ago
OpenStudy (anonymous):

i dont know

2 years ago
OpenStudy (anonymous):

8*72=576

2 years ago
OpenStudy (anonymous):

i wrote the answer above, all you need to do is compute it

2 years ago
OpenStudy (anonymous):

115.2

2 years ago