SOLUTION: the perimeter of a rectangle is 30cm. if the width is 5cm, what is it's length

Question 1119750: the perimeter of a rectangle is 30cm. if the width is 5cm, what is it's length
Found 3 solutions by Theo, MathTherapy, Alan3354:
Answer by Theo(13342)   (Show Source): You can put this solution on YOUR website!
perimeter = 2 * length + 2 * width.

perimeter = 30 cm
width = 5 cm

equation becomes 30 = 2 * length + 2 * 5

simplify to get 30 = 2 * length + 10

subtract 10 from both sides of the equation to get:

30 - 10 = 2 * length

combine like terms to get:

20 = 2 * length

divide both sides of the equation by 2 to get:

20 / 2 = length

simplify and solve for length to get:

length = 10.

length = 10 and width = 5

2 * length + 2 * width = 2 * (length + width) = 2 * (15) = 30

solution is:

length = 10 cm.

Answer by MathTherapy(10552)   (Show Source): You can put this solution on YOUR website!
the perimeter of a rectangle is 30cm. if the width is 5cm, what is ~~it's~~ its length

With length being L and width, W, we get: 2L + 2W = 30_____L + W = 15
L + 5 = 15 ----- Substituting 5 for W

Answer by Alan3354(69443)   (Show Source): You can put this solution on YOUR website!
it's = it is
RELATED QUESTIONS
if a rectangle has a perimeter of 30cm and the length is twice the width what is the... (answered by oscargut)
The length of a rectangle is twice its width. If the perimeter of the rectangle is 30cm... (answered by checkley77)
If the length of the rectangle is twice the width,and the perimeter of the rectangle is... (answered by JulietG)
The length of a rectangle is 5cm longer than twice the length of the width. If the... (answered by Boreal)
If the area of a rectangle is 30cm and the perimeter is 26cm. What is the length and... (answered by josgarithmetic)
the length of a rectangle is 3cm more than twice it's width. If it's perimeter is 30cm.... (answered by ewatrrr)
: The width of a rectangle is 5cm less than its length. If its perimeter is 38cm, find... (answered by ReadingBoosters)
the length of a rectangle is 5cm. greater than twice its width. if the perimeter is 52... (answered by sharon1948)
The length of a rectangle is 30cm less than three times the width. The perimeter of this... (answered by checkley77)