Zhejiang Education Press, sixth grade mathematics, Volume II, Page 40, Sub-question 5: What is the ratio of girls to boys in Class 6 (2) of Ziyang Primary School? ...
Let's assume that there are x people in the class, according to the equation of equality of boys.
(1-7/17) x = (1-9/17) * (x plus 4)
10/17x = 8/17x plus 32/ 17.
X= 16
People can't be scores. There is something wrong with the data on the topic. . . How did the people in front count to 9/ 19? If it is later, it will be 34!