Question 694705
 the table shows the present & later ages of father & son 
               son       father       sum           present age difference 
present age    x say      50-x         50 given      50-x-x
.................................................................
when son age
is same to 
present age 
of his father  50-x        50-x+50-x-x  102
...........................................................
so 50-x+50-x+50-x-x=102
or 150-4x=102
or 4x=150-102=48
or x=48/12=12 yrs = son's age
& father's age=50-12=38 yrs
ans