The perimeter of a rectangle is 280cm. The ratio of the width to the length is 3:4. What is the length of the rectangle?

So first we need to get the perimeter formula. P = 2 (w+l). We know P but we dont know w and h.

280/2 = 140. So now we know that 140 = w+l. We also know that the length is 4/3 times greater than the width (we used the ratio). To prove this 3*4/3 = 4, just like in ratio. So we have 2 equations

140 = w+l

l = 4/3w

Now we can plug into 140

140 = w+4/3w

So if you solve algebraicly you get

60 = w.

Now we can find that the length =

80 is the answer to length ...

Now to prove answer 60+80 = 140.

So the answer is

Width: 60Length: 80brainliest?