Find the width and the length.?

Question

The perimter of a rectangle is 40cm. The width is 8cm less than the length. Find the width and the length.

PLease help..i think i might have the right answer Lengthis 14..width is 6

Answer 1

well, lets start by assigning a variable to the unknown

length=L

the width then, (because it is 8 less than the length) is L-8

the perimeter is the distance all the way around which means two lengths and two widths so

L+L+(L-8)+(L-8)=40

4L-16=40
4L=56
L=14

and, width is 8 less than 14, and is 6

looks like you got it right

good job

keep at it
math is power

Answer 2

You're Absolutely Right.

Here is how:

VERIFICATION:

Perimeter of a Rectangle = 2 (l+ b)
= 2 ( 14 + 6)
= 2 8 20
= 40 cm. QED

Answer 3

Yes, you have the right answer!

The perimeter is 2*length + 2*width.
Therefore, length + width = 20
And you know length = width + 8

Therefore, (width + 8) + width = 20
So 2*width = 12
and width = 6
... and since length = width + 8, it follows that length = 14.

Answer 4

P = 2(L + W)
40 = 2(L + W)
20 = L + W

W = L - 8

20 = L + (L - 8)
20 = L + L - 8
20 = 2L - 8
2L = 28
L = 14

W = 14 - 8 = 6

Length = 14cm
Width = 6cm

Answer 5

width = ( X-8 ) length = X

2X + 2(X - 8) = 40
2X + 2X -16 =40
4X - 16 =40
4X = 56
X = 14

length is 14 ...... width is 6 YOU ARE RIGHT

Answer 6

Yeah you're right. Perimeter of rectangle is 2(l)+2(w). Just sub in the two numbers and check your answer.

Answer 7

you are correct,

the perimeter 40 would equal 2X + 2(X-8)
4X=56
X=14
14-8=6

Answer 8

You forgot to add the abbreviation (cm.) but other than that, you got it right.

Answer 9

I think thats right

Answer 10

Yeap you've got it correct!!