Answer:
30%
Explanation:
Key skills needed: Probability
1) There is a 70% chance of rain. 
2) We need to find the chances against rain. 
3) To do this, we need to use the fact that
70% + x = 100% (Since all the probabilities add up to 1 or 100%) 
4) If you subtract 70% from both sides, x = 30%
5) This means the probability against rain is 30%. 
Hope you understood and have a nice day!! :D