There are 20 questions in the math contest. If you do one question correctly, you will get 5 points; if you do one wrong question, you will be deducted 1 point. Liu Ming got 88 points. Do you know how

It is 20×5= 100.

The wrong one is 5+ 1= 6 points less than one.

Now 100-88= 12 is missing.

So wrong 12÷6=2.

20-2= 18

You got it right 18.

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