No you don’t. Oh, wait, maybe you do. You have the “right” to live in your parents house rent free, provided with food, clothes, heat, water, a bed. In return you can be grateful for all these things and help out around the house when asked.
I HATED word problems like this!! I could never figure them out no matter what the teacher tried to show me. I could never figure out how this was supposed to be relevant to real life.
That’s why you don’t do a countdown. Just snap the picture as soon as they’re in position.