I hope there are 660 students in Grade Four and Grade Five, and the number of students in Grade Four is 1.2 times that of Grade Five. How many people are there in each grade? (Write the equivalence relation first, and then list the solutions of the equation)

Equivalence relationship: number of fourth graders+number of fifth graders = 660; Number of fourth-grade students = 65438+ 0.2 times of the number of fifth-grade students.

Solution: Let the number of fifth-grade students be X, and the number of fourth-grade students be 1.2x, which is obtained from the question.

x+ 1.2x=660

2.2x=660

x=300， 1.2x=360

A: There are 360 students in the fourth grade and 300 students in the fifth grade.