What is the origin of the tennis scoring system?

Question

Why does it start at 15 then go to 30 and then 40? Why do we use 'love' as the zero score?

Answer 1

at the beginning of tennis they used a clock for counting. the minutes of the clock determined the score 0, 15, 30, 45

later 45 was considered too long to pronounce, so it was changed to 40.

love for zero indeed comes from the french word l'oeuf (the egg)

Answer 2

love is le euff the french word for egg being round meaning zero sorry about the spelling spell check wont do french words