The width of a rectangle is 5 cm less than the lenght The perimeter is 300 cm Find the length and width?

Answer 1

L: x
w: x-5

P=2w+2L
300= 2(x-5)+2x
300=2x-10+2x
300=4x-10
310=4x
x=77.5

W=72.5cm and L=77.5cm

Answer 2

width = 72.5
length = 77.5
the difference is 5.
If all sides were equal, they would be 75 (300/4).
Since the difference between length and width is 5, add 1/2 of 5 to the longer side to be and subtract 1/2 of 5 from the shorter side to be.
Check your math by adding all sides together = 300

Answer 3

width: w
length: L
Perimeter: 2 w + 2 L = 300

width = L - 5
length = L

substitute
2 ( L - 5) + 2 (L) = 300

Distribute
2L - 10 + 2L = 300

Combine Like Terms
4L - 10 = 300

Add 10 to both sides
4L = 310

Divide by 4
L = 77.5 cm

Substitute L to find w
w = L - 5
w = 77.5 - 5
w = 72.5 cm

Answer 4

The equation for perimeter is
P=2L + 2W

You know that p=300, and that W=L-5 (5 less than length)

When you plug those in, you get
300=2L + 2(L-5)

and you solve:

300=2L +2L-10.
310=4L
77.5=L

Now that you found L, plug it in the original equation, and solve for W.

300=2(77.5) + 2W
300=155 + 2w
145 = 2w
72.5=w

So, lenght equals 77.5, and width equals 72.5.

Answer 5

l = length
l-5 = width
2l + 2(l-5) = 300
2l +2l -10 =300
4l = 310
l=310/4 = 77.5 cm
w= 77.5-5 = 72.5 cm

Answer 6

300cm - 10cm = 290cm

290cm Divided by (where is the divide sign on a keyboard?!) 4 = 72.5.

72.5cm + 72.5cm = 145cm
72.5cm + 72.5cm + 10cm (5cm per side) = 155cm
155cm + 145 cm = 300cm!!!

is that right!?!
if it is then you just divide by 4 - 10, add 5 cm to two sides and leave the other two as they are.
no need for all this l=2 x,y,z blah blah blah!!!
thats the way i think anyway! it's probably not right anyway!

Answer 7

300=2w+2l
w = l-5
300=2(l-5)+2l
300=2l-10+2l
300=2l+(-10)+2l
310=4l

77.5=l

w=l-5
w=72.5

l=77.5 w=72.5
very simple ._.

Answer 8

15 and 20...

check it out if im ryt!

=)