If statements without brackets.

So I'm i'll have my exam later today and was hoping to get some clarification on if and if else statements that do not have brackets and how to read them. I can read if else, and else if statements with brackets easily and they make sense to me but these have always confused me, here is a sample question.

if (x > 10)      
     if (x > 20)
          printf("YAY\n");    
else      printf("TEST\n");