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Seek a detailed explanation of this elementary school problem
Picture on the left:

Table height-lying cat+sitting cat = 150 cm... 1

Right:

Table height+lying cat-sitting cat = 1 10 cm ...

Add equation 1 and equation 2 to get:

Twice the height of the table =150cm+110cm = 260cm.

Therefore, the height of the table = 130cm.