In a math contest, a total of 20 questions were done correctly +5 points, and one wrong question was deducted 1 point. Xiaohua got 64 points in the exam. How many questions did Xiaohua do right?

A math contest * * * got +5 points for getting 20 questions right and +0 points for getting them wrong, and Xiaohua got 64 points. How many questions did Xiaohua do right?

Solution:

Score of all pairs: 20×5= 100.

Actual score: 64 points

Difference score: 100-64=36 points

The score difference of each correct question becomes a wrong question: 5+ 1=6 points.

Actual wrong answer: 36÷6=6 questions

Actual correct answer: 20-6= 14.

A: Xiaohua got it right 14.

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