A dad is teaching his son how to do math.

A father is teaching his youngster how to perform math.
He responded: “Okay, son, if I have five apples and I give you two, how many apples do I have left?”
The son considers for a bit before saying, “You have three apples left, dad.”
The father nods before asking, “Now, if I give you another two apples, how many will you have?”
The son replies, “I’ll have four apples!”
The father smiles and replies, “Exactly! And I won’t have any apples since you’re taking them all!”