He us filling it with 6 eggs
We suppose the total chance is 100%. So the chance of wind and rain accounts for 30%. Then it is given rainy. So the total chance will change to 80% and the chance of wind and rain remains constant. Then you can get the answer should be 30%/80%=37.5%≈38%.
Answer:

The power on the 10 can be used to count the number of zeros in the answer.