Please any one have a clue on this

Answer:
81.9÷0.6=13.6
Step-by-step explanation:
I took 81.9 because that's the given measure. But then 81.9 is only the whole measure. We only need from M to B which is x. So that's why it's 2/3. So that's why I put 2/3 as a decimal and divided. Hope this helped!