Question 1181831
let the numbers be x & y

Two numbers differ by 13.

x-y =13-----------------------1

 Their sum is 29.

x+y =29 ---------------------2

Add equation 1 & 2

2x = 42

x =42/2
x =21

plug x  in equation 2

x+y =29
21+y=29
y = 29-21
y =8

The numbers are 21 & 8