Here are some examples:
* Ilan ang mga tao sa silid? (How many people are in the room?)
* Ilan ang pera mo? (How much money do you have?)
* Ilan ang mga libro mo? (How many books do you have?)
It can also be used to inquire about the number of times something happens or has happened.
* Ilan beses ka nang nakapunta sa Japan? (How many times have you been to Japan?)
* Ilan ang mga pagkakamali mo sa pagsusulit? (How many mistakes did you make on the test?)
"Ilan" is a versatile word that can be used in a variety of contexts to ask about quantity or number.