If you have 15 20A single breakers and 20A and 30A ganged breakers how do you figure the total amps if the box is rated at 200A?

Total amps or calculated load has nothing to do with the number of breakers and their sizes. It is more complicated than adding the sum of the breakers, if you do that you will see that they would exceed 200 amps. It is based on square footage for the general receptacle and lighting loads,3000 watts is allowed for small appliances and this is just the beginning.

Some experienced electricians have trouble with the calculations. If you are trying to see if you have enough capacity for an addition or some upgraded equipment,and you have breaker space,the chances are you will be O.K. Overloading the service would cause the main to trip.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.