1、
Class one is more than class two 1/5.
Suppose one is person A and the other is person B,
Then a = b+b/5 = 6b/5.
So a:b=6:5
That is, the number of people in class one: the number of people in class two = 6: 5.
namely
Class one accounts for 6/ 1 1 of the total number of students.
The number of students in Class Two accounts for 5/ 1 1 of the total number of students.
2
There are more boys than girls in Class One 1/4.
Suppose a class of boys is C and girls are D,
Then c = d+d/4 = 5d/4.
That is, a class of boys: a class of girls = 5: 4.
namely
Boys in Class One account for 5/9 of the class.
Girls in Class One account for 4/9 of the class.
3、
There are more boys than girls in Class Two 1/8.
Suppose there are m boys in Class Two and n girls in Class Two.
Then m = n+n/8 = 9n/8.
Boys in Class Two: Girls in Class Two =9:8.
namely
Boys in Class Two account for 9/ 17 of Class Two.
Girls in Class Two account for 8/ 17 of Class Two.
4、
Ratio of male to female in two classes
Boys in two classes = 6/11× 5/9+5/1× 9/17 = 915/(9×1×
Girls in two classes = 6/11× 4/9+5/1× 8/17 = 768/(9×1×1.
So boys in two classes: girls in two classes = 9 15: 768 = 305: 256.