1. Waarom heeft de puntentelling de volgorde: 15, 30, 40?
Tennis scoring has its origin in medieval numerology. The number 60 was considered to be a "good" or "complete" number back then, in about the same way you'd consider 100 to be a nice round figure today. The medieval version of tennis, therefore, was based on 60--the four points when 15, 30, 45 (which we abbreviate to 40) and 60, or game.
tis dus 15 - 30 - 45 - 60/game en 40 lag idd beter in de mond dan 45