Answer: 48 days
Explanation:
Hi, to answer this question we have to analyze the information given: 
- "A meteorologist said it rained during 20% of the past 60 days "
 
So, first we have to multiply the number of days (60) by the percentage (20%) 
20% = 20/100 = 0.2 (decimal form) 
60x 0.2 = 12 days rained 
Finally we subtract the days obtained to the total days (60) to obtain the number of days that it didn't rain. 
60-12 = 48 days 
Feel free to ask for more if needed or if you did not understand something.