Learn Turkish: Kilosu altmış. - Her weight is sixty.

The root word is kilo (weight). To say 'his', 'her', or 'its' weight, we add the 3rd person singular possessive suffix. Because kilo ends in a vowel, we must use the buffer letter s to separate the vowels. Then, following 4-way vowel harmony (since the last vowel is o), we add u. That gives us the ending -su.

How do we know it means 'Her weight' and not 'His weight'?

We don't without more context! Turkish is completely gender-neutral. The 3rd person possessive suffix (-su here) can mean 'his', 'her', or 'its'. The translation provides 'Her' just as one correct example, but it could easily refer to a man or an animal depending on who you are talking about.

Where is the word for 'is' in this sentence?

In Turkish, basic present-tense statements like 'A is B' often don't need an actual verb. By simply putting the subject (kilosu) and the number (altmış) next to each other, the 'is' is automatically understood.

Does kilo mean 'weight' or 'kilogram'?

It is used for both. In English, you usually say 'My weight is...', but in everyday Turkish, people just use the word kilo when talking about body weight. So this sentence literally translates to 'Her kilos are sixty'.