Answer:
10X + 20 +5X +25 = 180
15x=180-45
X= 135/15
X=9
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Answer: the last one
Step-by-step explanation: 
 
        
             
        
        
        
Put all numbers in smallest to largest order
if there are an odd number of results, the median is in the middle
if there even, then its the mean of the two central numbers
        
             
        
        
        
Answer:
C. 18
Step-by-step explanation:
4-6 paris = about 23
10-12 pairs = about 5
28 - 5 = 18