Answer:
Jim weighs 138 lb. Mark weighs 104 lb.
Explanation:
Let Mark's weight = M
The Jim's weight = M + 34
The combined weight is M + M + 34
The combined weight is 242 b, so
M + M + 34 = 242
2M + 34 = 242
2M = 208
M = 104
Mark weighs 104 lb.
M + 34 = 104 + 34 = 138
Jim weighs 138 lb.