Step-by-step explanation:
We can make 2 equations as follows:
2x = y + 16 and x + 2y = 18
x + 2y = 18 is the same as x = 18 - 2y. Hence, 2(18 - 2y) = 2x = y + 16.
2(18 - 2y) = y + 16
36 - 4y = y + 16
5y = 20
y = 4.
 
        
             
        
        
        
The answer is 2. I hope this helped.
        
             
        
        
        
Put the event number at the bottom where it say event
        
             
        
        
        
Answer:
48 is the even number
81 is the square number
13 43 23 are the prime numbers