This isn’t hard, but I’ll help you. I won’t give the answer though. Simply do 61,061.83 divided by 12. That answer of that, divide that by two and you should have your answer
I would do it in Buhh I'm working so add all of them(16,18,20) together 6 times then add another 16 and 18 and you will get your answer.
Answer is AAS hope this helps