it is a maths question for students aged around 14 in my country. I am shamed that I don't know how to solve it
The question is something like:
Person A has a sum of money on Monday, and he spent $10 EACH day, and then he will save HALF of the money left on that day. After he spent $10 on Friday, he had no more money left. So how much did he orginially have on Monday?
At first I don't quite understand the question, but here I hope to clarify something that, Person A spent $10 FIRST on each day, then there will be some money left, then he will save half of the money left, and the rest of the money (not saved or spent) will be counted as the starting point of money for the next day.