"Un litru are o mie de mililitri."

Translation: One liter has one thousand milliliters.

[MarinaBull2]

Why isn't the non-American spelling of "litres" and "metres" accepted Duolingo!!??

[NattKullav1]

Today (2017/03/05), they accepted "One litre has one thousand millilitres."

[MarinaBull2]

It's weird that sometimes they accept and sometimes they reject the spelling.

[BenYoung84]

Each lesson has the list of possible answers manually maintained so they often don't line up. Using the report button helps them to improve things.

[LouisSepdekdu]

Do Romanians actually say that one litre has 1000 millilitres? While I'm asking, do English-speaking people say that? I would say one litre is 1000 ml.