The boys in Nikolay Bogdanov-Belsky’s 1895 painting Mental Arithmetic are having a difficult time solving the problem on the board:

As it happens, there’s a simple solution: Both (10² + 11² + 12²) and (13² + 14²) are equal to 365, so the answer is simply (365 + 365) / 365, or 2. They’ll figure it out.