How many students from EACH grade are in the assembly?

There are 92 students in an assembly.   The number of 7th grade is 7 more than the number of 6th graders. The number of 8th graders is 3 less than the number of 7th graders.  How many students from EACH grade are in the assembly?
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1 Answer

me assume "all"=grades 6+7+8

all students=92=g6+g7+g8

g7=g6+7

g8=g7-3=g6+4

all: g6 +(g6+7) + (g6+4)=92

3g6=92-7 -4

3g6=81

g6=81/3=27

g7=g6+7=34

g8=g7-3=31
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