Primary school to junior high school mathematics core test paper answer primary school to junior high school mathematics core test paper answer

Because the topic is known, he answered all the questions, so it is impossible to rule him out. So suppose he did the X problem correctly and he did the wrong (15-x) problem. Inequality according to equivalence relation:

8x+4( 15-x)=72

The solution is x= 1 1.

So he answered the question 1 1 correctly.

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The photo answering artifact writes an addition formula with the number 5: mouth+mouth = mouth+mouth = mouth+mouth = mouth+mouth = mouth+mouth = mouth+mouth = mouth+mouth = mouth+mouth =5.