There are 55 people in class 61, class 62.57 to make the ratio of class 61 to class 62 7:9, how many people should be lost in class 61 to class 62
If class 61 is assigned to class 62, then class 61 is (55-x) and class 62 is (57 + x)
(55-x):(57+x)=7:9
That is, (55-x) = 7 (57 + x)
495-9x=399+7x
7x+9x=495-399
16x=96
x=6
A: six people should be transferred from class 61 to class 62