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Gの点数をxとすると
A=x-11
B=x+16
C=x-25
D=x+21
E=x-15
F=x-5
H=x-21

A~Hの合計点数は8x-40
平均点は(8x-40)÷8=x-5
これが70点なのでx=75点

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