Suppose Dong Liu did it right.

At this time, you can get an integral of 5*20= 100.

Deduct 5+3=8 points for each wrong question (5 points for right and 3 points for wrong).

Wrong: (100-52)÷8=6 questions.

Right: 20-6= 14.

Law of integer division

1) Start with the high order of the dividend, first look at how many digits there are in the dividend, and then try to divide the dividend by the first few digits. If it is less than the divisor, try dividing it by one digit.

2) Write the quotient except the dividend on the dividend.

3) The remainder after each division operation must be less than the divisor.

Divider is the law of fractional division of integers;

1) is removed according to the law of integer division, and the decimal point of quotient should be aligned with the decimal point of dividend.

2) If there is a remainder at the end of the dividend, fill in zeros after the remainder and continue the division.