The fourth number is 51. 48+49+50+51= 198. 
THE NUMER IS 48
        
             
        
        
        
Measure it hope that helps if not that's on me
        
             
        
        
        
Answer:
 The answer is the length of time in one time interval
 
        
             
        
        
        
Answer:  The area of the photo that fits the frame is 192 square inches.
Step-by-step explanation:
Hi, to answer this question we have to apply the next formula:
Area of a rectangle (A) = Length x width
Replacing with the values given and solving for A (area):
A = 16 x 12 = 192 in2
The area of the photo that fits the frame is 192 square inches.
Feel free to ask for more if needed or if you did not understand something.
 
        
             
        
        
        
You would multiply by the reciprocal (flip the fraction)
5/3 * 24 = 40
b = 40