Xiaoming Taiji Recruitment

The recruitment problem of Ma Yun Company stumped tens of thousands of graduate students: Xiaoming borrowed 500 yuan from his father, 500 yuan from his mother and 970 yuan for a pair of shoes. The remaining 30, 10 yuan for dad, 10 yuan for mom, 10 yuan for himself, 490 yuan for dad and 490 yuan for mom. 490+490=980。 Add yourself 10 =990. Where is 10? What's going on here?

This is an error in the calculation method. 970 for shoes, plus 10 for parents, and the rest 10 for myself, which is exactly 1000.

The borrowed money and the remaining money in the title cannot be added, but subtracted, and the result of subtraction is the money spent.