Solution 10

1 2 3 4 5
L1
en
twene
thria
fiuwar
fif
L2
jedyn dwaj tři štyri pjeć
L3 i liang san ssu wu
L4
eka dvau trayas catur pañca
L5 ichi ni san shi go
L6 echad shnayim shlosha arba?a chamishasha
L7 mot hai ba bon nam
L8
ün duos trais quatter tschinch
L9 hana tul set net tasŏt
L10
yaw daw dree tsaloor pindze
L11
uno dos tres
cuatro
cinco
L12 nigen khoyar ghorban durben tabon

 

The languages in bold type, i.e. the languages 1, 2, 4, 8, 10 and 11 are related, They all belong to the Indo-European language family.

Most people identify at least some of these languages as belonging together on this very small basis. This, of course, is not sufficient to prove that these languages are related, but it shows that basic numbers are an excellent field of study for this kind of question.

Just in case you are interested, these are the languages involved in the exercise:

L1 Old English

L2 Czech

L3 Mandarin Chinese

L4 Sanskrit

L5 Japanese

L6 Hebrew

L7 Vietnamese

L8 Rhaeto-Romanic

L9 Korean

L10 Albanian

L11 Spanish

L12 Mongolian