Question

Sum of two numbers is 13 if we replaced the number then we get the difference of 9

Answer 1

let the num. are x and y
atq-- x + y = 13 ...( 1 )
and y - x = 9 ...( 2 )
...( 1 ) + ...( 2 ) =
2y = 22
y = 11
put the value in ...( 1 )
x + 11 = 13
x = 13 - 11
x = 2