Question 774161
N1 + N2 = 138
N2 = 42 + N1

42 + N1 + N1 = 138
42 + 2N1 = 138
2N1 / 2 = (138 -42) / 2
N1 = 48..ANS.

N2 = 42 + N1
N2 = 42 + 48
N2 = 90..ANS.

N1 + N2 = 138
48 + 90 = 138
138 + 138