Question

Jabian buys pencils as souvenirs from his vacation to give to his friends. He starts with 90 pencils and gives away 15 each hour until he has no pencils left.

Answer 1

If he gives 15 pencils out each hour than all you need to do is divide
90/15=6
6*15=90
So it would take 6 hours for him to run out of pencils.
Hope this helps!