The fourth grade of Yucai Primary School held a math contest with 20 questions. If you do a question correctly, you get five points, and if you don't do a wrong question, you get two points. Xiao Qiang scored sixty-four points. He did as many wrong questions as he didn't. How many questions did Xiao Qiang get right?

Method 1:

Solution: Let Xiao Qiang get the X problem right and (20-x)/2 wrong.

According to the meaning of the question: 5x-2*(20-x)/2=64.

5x-20+x=64

6x=84

X= 14

Xiao Qiang got it right 14 questions.

Method 2:

The questions that Xiao Qiang did wrong and didn't do were:

(20×5-64)÷(5+2+5),

=36÷ 12,

=3 (road),

20-3×2= 14 (road),

Xiao Qiang got it right 14 questions.