All you need to do is add 37+16 and it will be equivalent to 53
        
             
        
        
        
I will show you how to do the first one.....we are finding the GCF...the largest number that goes into each number (same for variables)
1.)  20yx , 80x³  ( factor each number and variable)
20  =  2, 4, 5, 10, 20
y    =  y
x     =  x
80  =  2, 4, 5, 8, 10, 16, 20, 40, 80
x³  =  x, x, x
what is the largest number that 20 and 80 have in common?    20...
how about the variables?    x
so, the Greatest Common Factor (GCF is 20x)
        
             
        
        
        
10% of the 50  were red.
10% * 50
(10/100) * 50
(1/10) * 50
= 5
5 were red.
        
                    
             
        
        
        
5/1 is the reciprocal of 1/5