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1 olympiad problem. Primary school level. There is no equation. There are 6 18 students in grade 456 in a school.
The fourth level is 1, the fifth level is (1+1/0), and the sixth level is (1+10) * (1)
1+ 1. 1+ 1. 1*0.9=3.09。
The number of fourth-grade students is 6 18/3.09=200.
The number of fifth-grade students is: 1. 1*200=220.
The number of sixth-grade students is: 220*0.9= 198.