Math Riddles

 
loss (medium)

Question: someone came into my shop and stole 100 dollars from the register without my knowledge. the person came back 5 minutes later with the same 100 dollars and bought 70 dollars in items and i gave him back 30 dollars change. How much did i lose?


Question: I'm 10 years old my brothers half my age now I'm 100 years old how old is my brother now?