What's the problem you want to ask
        
             
        
        
        
Answer:
Cost of 4 muffins = $3.45
Cost of 12 muffins = (3 sets of  x 4 muffins = 12)
Cost of 3 sets of muffins = $3.45 x3 = $10.35
Step-by-step explanation:
 
        
             
        
        
        
Let the number be x and 2x-5 from the above given condition
 x+2x-5=70
or
3x=75 s0 x=25
Hence, the number are 25 and 45