AFCAT Model Paper 8

Given:
Total number of eggs = 100
number of eggs left after giving 80% of good eggs = 36
Calculation:
Let the number of rotten eggs be a.
The total number of eggs is 100.
Remaining good eggs = 100 – a
Now, he gives 80% of the good eggs to his neighbors and he is left out with 36 eggs.
∴ 100 - 80% of (100 – a) = 36
⇒ 100 – 80 + 0.8a = 36
⇒ 20 + 0.8a = 36
⇒ 0.8a = 16
⇒ a = 20