Huh? Their muscles have a higher strength potential, and an average chimpanzee will far exceed the strength of an average human, even at the weight differences between them. It does not take that much force to break a neck or crush a skull, a chimpanzee can easily handle it.
You can't look at it as a math equation. You have to imagine this fucker trying to pull your arm out of its socket. You can hardly punch it into submission. View attachment 83263