This topic has been deliberately misleading you. This is a very simple question. You can solve it step by step. It won't miss a point. "I borrowed 500 yuan from my father, 500 yuan from my mother, bought a pair of shoes, spent 970 yuan, and left 30 yuan. I returned 10 yuan to my father, 10 yuan to my mother, and kept 10 yuan for myself." There is nothing wrong with this part of the topic. Calculate (500+500)={970+ 10 (dad)+10 (mom)+10 (self) }= 1000 and then calculate the average value of 970/2 = 485+60.

I still owe my father 490, my mother 490,490+490+myself 10 = 990 yuan. Where is the remaining ten yuan? This part is wrong.

Calculate carefully, list the steps, and the answer is self-defeating. It's actually quite simple.

Buy shoes and stay in 30 yuan.

Mom and Dad paid each other 10 yuan, which means 20 yuan was returned.

I have 10 yuan left.

It can be concluded that: 970+10+/kloc-0+10 =1000.