Current location - Training Enrollment Network - Mathematics courses - A math contest was held in Beijing Road Primary School. A total of 20 questions 10, 5 points will be deducted for each question. Wang Leyan's score is 1 10. How many questions did he answer correctly?
A math contest was held in Beijing Road Primary School. A total of 20 questions 10, 5 points will be deducted for each question. Wang Leyan's score is 1 10. How many questions did he answer correctly?
Solution: If he answers X correctly, he answers 20-x wrong.

10x-(20-x)×5 = 1 10

10x- 100+5x = 1 10

10x+5x = 1 10+ 100

x=2 10÷ 15

x= 14