The answer to this questions is letter B
Answer:
It's 16 units. Just look at the lengths and how many times they are on a shape. The shape is a rectangle, which means there will be two of each length, so just add them all together. 6+6+2+2=16
There's more than one way to combine them really
but an obvious one will be
Multiply by 3/5 (three fifths)