Let the two numbers be x and y
According to 1st condition ,
x+y=128 ------{1}
According to 2nd condition ,
x-y=16 --------{2}
Adding equation 1 and 2
x+y=128
+ x-y=16
---------------------------
2x=144
x=72
put x=72 in first equation ,
72+y=128
y=128-72=56
y=56
Hence , the first numbers are 72 and 56