In math class, I always output a question: in a subtraction calculation, the sum of the minuend and the subtraction is 360, and the difference is twice that of the subtraction, so what is the difference? The sum of the difference between the minuend and subtraction is 360.

We can get: minuend = subtraction+difference =360÷2= 180.

180 ÷ (1+2+1) = 45 This is subtraction.

45×( 1+2)= 135 This is the difference.

The error is twice that of difference or subtraction, that is, the difference is three times that of subtraction, so we use180 ÷ (1+2+1).

Answer: The difference should be 135.