2+2+2+2+2+2+2+4+6+3+9+2+5+6+3+9+3+2+6+4+3+7+2+9+5+3+7+3+2+6+4+3+2+7-39

100

Step-by-step explanation:

My ctrl+c and ctrl+v skills say the answer is 100

So,

Let l represent the length and w represent the width.

The first statement translates to:
2l + 2w = 72

The second statement translates to:
l = 2w

We will use substitution, as this is the easiest method.
2(2w) + 2w = 72

Distribute.
4w + 2w = 72

Collect Like Terms.
6w = 72

Divide both sides by 6.
w = 12

l = 2w
l = 2(12)
l = 24

Check.
2(24) + 2(12) = 72
48 + 24 = 72
72 = 72 This checks.

Length = 24 cm
Width = 12 cm