Answer:
The numbers are 39 and 14.
Explanation:
Equation 1, sum of the numbers: 
 
x + y = 53 
 
Equation 2, difference of the numbers: 
 
x - y = 25 
 
System of equations: 
 
x + y = 53 
x - y = 25 
---------------- 
2x = 78 
 
x = 39 
 
Solve for y: 
 
39 + y = 53 
 
y = 14 
 
The numbers are 39 and 14.