You have a point, there have been some difficulty issues in the past. But I don't agree that today's B is really as intellectual and math-involved as your (and many others') comment suggests.
Yes, it has a solution which is very math-involved (checking all divisibility rules for $3$/$7$/$9$). But this is not the only way to solve the problem. There are other, much less "mathy" ways. I will illustrate one of them in the official editorial.
You have a point, there have been some difficulty issues in the past. But I don't agree that today's B is really as intellectual and math-involved as your (and many others') comment suggests.
Yes, it has a solution which is very math-involved (checking all divisibility rules for $3$/$7$/$9$). But this is not the only way to solve the problem. There are other, much less "mathy" ways. I will illustrate one of them in the official editorial.