Question

what are those two numbers whose sum is 58 and difference us 38?

Answer 1

Let two numbers are x, y
X+Y=58
X-Y=38
By solving we get X=48,and y=10

Answer 2

$x + y = 58$
$x - y = 38$
Adding above equations
$2x = 96$
$x = 48$
and
$y = 10$
thus numbers are 48 and 10.