And say what instead? Is the author saying that moms are lazy, and say that they don't know the answer just to offload the work to the dad? Or are they genuin

And say what instead? Is the author saying that moms are lazy, and say that they don't know the answer just to offload the work to the dad? Or are they genuinely bad at math, and in that case what are they supposed to say to their kids? Not disputing the fact that the role model is important, but what is the alternative here?