Question 85007
Let the two numbers be x and y.
Then x+y = 29 and x - y = 7

Adding the above two equations we get,

2x = 36
==> x = 36/2
==> x = 18

Substituting in the first equation,

18 + y = 29

==> y = 29-18
==> y = 11

Thus the two numbers are 18 and 11.

Good Luck!!!