Understanding Money

Kabir watches his mother withdraw cash from an ATM and says, "The machine just gives out money — you can take as much as you want." His sister Anaya disagrees. Who is right?

Dev buys a notebook for ₹35 and pays with a ₹50 note. The shopkeeper hands back ₹15. Dev thinks he's been shortchanged. His friend Yash says that's exactly the right amount. Who is right?

Mehar has five ₹100 notes. Her brother Arjun has one ₹500 note. Mehar thinks she has less money than Arjun, "because he only has to carry one note, and I have so many." Arjun says they have exactly the same amount. Who is right?

Riya gets ₹200 pocket money at the start of the month and spends all of it in the first week on stickers and snacks. In the third week, she wants a ₹150 pencil box, but she has no money left. She says she should still be able to buy it because "it's still the same pocket money month." Her friend Zoya disagrees. Who is right?