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Zhang Hong primary school mathematics
20*7= 140 points

140- 100=40 points

40/(4+7)=3 (Dao) ... 6 (points)

He answered three questions wrong.

[ 100+4 * 3]/7 = 16.

He got it right 16.

20- 16-3 = 1 channel

He didn't answer at all.

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