Learn Turkish: Dolapta iki tane ceket var. - There are two jackets in the closet.

In Turkish, when you use a number or a quantity word (like iki or kaç), the noun that follows must stay in its singular form. You never add the plural suffix -lar or -ler after a number, so it is just iki ceket.

What is the word tane doing in this sentence?

Tane literally means item or piece. Turkish speakers often put it between a number and a noun when counting physical objects. Saying iki ceket is perfectly fine, but iki tane ceket is a very natural and common way to say two items of jackets.

How would I ask a question to get this sentence as an answer?

Since you are learning about kaç (how many), the natural question for this sentence is Dolapta kaç tane ceket var? (How many jackets are in the closet?). Notice how kaç tane perfectly replaces the number phrase iki tane.

Why does dolap (closet) take the suffix -ta instead of -da?

The suffix for in or on is usually -da or -de. However, dolap ends in p, which is a hard consonant. Because of Turkish consonant matching rules, the d in the suffix changes to a t to match, making it dolapta.