In semester I, the number of good students in class 6D was equal to 2/7 of the remaining students. Into semester II, the number of good students increased by 8 students ( the number of students of the class was unchanged), so the number of good students became 2/3 of the rest. How many good students of class 6D were there in semester I ?
Ai làm nhanh mà đúng, mình tích cho !