Answer:
1 egg
Explanation:
One third of a birds eggs hatched is the first egg. The sentence say if 2 eggs hatched how many eggs did the bird lay is the second egg. 3 eggs - 2 = 1 egg
The bird laid 6 eggs
If of the birds egg has hatched; and if that one third is quantifiable as 2. We know that of the laid eggs (we can declare that as x) is 2.
So:
Now multiply both sides by 3:
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of the birds egg has hatched; and if that one third is quantifiable as 2. We know that 
of the laid eggs (we can declare that as x) is 2. 
