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Su teaches printing plate fourth grade second volume mathematics lesson 3 exercises the answer.
Solution: Let's assume that there are X students in the fourth grade participating in the math interest group.

The students who participated in the math interest group in the fifth grade are 3X-35.

X-(3X-35)=4 1

-2X+35=4 1

X=-6 (truncated)

3X-35-X=4 1

2X=76

X=38

3X-35=79

A: There are 38 students in Grade Four and 79 students in Grade Five.

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