Read carefully and slowly - actually understand the words: it's a brain exercise If I had 4 eggs
A thief gives me 3 eggs
My farm rooster lays 5 eggs
How many eggs do I have?

The total number of eggs he finally has as inferred from the riddle is 3 eggs.

Evaluating each sentence :

If I had 4 eggs ; This is an imagination, hence, the speaker was only imagining if he had. Hence, total here is 0

A thief gave out 3 eggs ; Hence, the total number of eggs = (0 + 3) = 3 eggs

Farm Rooster laying 5 eggs is impossible S Farm roosters do not lay eggs. Number of eggs here is 0.

Hence, the total number of eggs = (0 + 3 + 0) = 3 eggs.

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