Question

___ old friend of mine helped me paint the house.​

Answer 1

Answer:

An old friend of mine helped me paint the house.

Answer 2

Answer:

An

Explanation:

An old friend of mine helped me to paint the house

Reason:

As we can see after the blank it is the word old and it starts with letter 'O' and its a vowel and that means we have to put an.

hope it's helpful to you!