Jun used 56cm of ribbon to go around the edge of a rectangular lid. The lid was 13 cm long. What is the width of the lid?

The width of the rectangular lid is 15 cm.

Step-by-step explanation:

1. Let's review the information given to us to answer the question correctly:

Length of the ribbon used by Jun = 56 cm

Length of the rectangular lid = 13 cm

2. What is the width of the lid?

The ribbon used by Jun is equivalent to the perimeter of the rectangular lid, therefore:

Perimeter = 2 * Length + 2 * Width

Replacing with the values we have:

56 = 2 * 13 + 2 * Width

56 = 26 + 2Width

2Width = 56 - 26

2Width = 30

Width = 30/2

Width = 15

The width of the rectangular lid is 15 cm.

15 cm

Step-by-step explanation:

To solve this problem, you need to use the formula for the perimeter of a rectangle because perimeter is the measure of all of the sides in a shape. In this case, Jun wrapped 56 cm of ribbon around the perimeter of the rectangular lid.

Substitute:

P = 2l + 2w

56 = 2(13) + 2w

Multiply:

56 = 2(13) + 2w

56 = 26 + 2w

Subtract 26 on both sides:

56 = 26 + 2w

-26   -26

30 = 2w

Divide by 2 on both sides:

30 = 2w

/2     /2

15 = w