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Mathematics of Grade Three in Beijing Primary School, Volume II, 16, thinking questions, how to do it and how to explain it.
Such as the title:

1, just+red =55

2, rigid+strong =60

3, strong+red =57

From 1 and 2, we can get: 4, strong-red =60-55=5.

From 3 and 4, red =(57-5)÷2=26.

So: just =55-26=29.

Strong =57-26=3 1

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