To my knowledge “alles klar” is phrase (that teachers use a lot at school) to make sure you understand everything and literally means “is everything clear?”. In ordnung literally means “in order” and is closer to the given translation of “alright”. Alles klar also means “Hello”.

So, 20 in Russian is двадцать (dvadsat’). If you wanted to say 25, you’d take the 5 (пять/pyat’) from the numbers you learned in 1-10 and combine the two. 25 becomes двадцать пять – dvadsat’ pyat’….Learn Russian: How to Count In Russian From 1-100 in 5 Minutes.

Part 3: How to count in Russian – Russian language tutorial and phrasebook

Numbers 1 – 10

Russian numbers: 11 to 19

1. 11 – одиннадцать
2. 12 – двенадцать
3. 13 – тринадцать
4. 14 – четырнадцать
5. 15 – пятнадцать
6. 16 – шестнадцать
7. 17 – семнадцать
8. 18 – восемнадцать