What is the height of the table?

Height of the table is 150 cm,

Lets say height of the cat is X
height of the tortoise is Y
and height of the table is Z

so from the first image our equation goes like this : Z – Y + X = 170
Similarly from second image our equation goes like this : Z – X + Y = 130

Now if you add both of these equations you will get (Z – Y + X ) + (Z – X + Y) = 170 + 130
which is nothing but 2Z = 300 that also means Z = 150

So we can see height of the table (Z) is 150 cm.