Question 1077694
let their ages be a , b and 2b
a+b/2=14....i
a+2b/3=16..ii
solving we have 
a+b=28....iii
a+2b=48...iv
a=28-b......v
subtitute a in eqn iv
28-b+2b=48
b=20
subtitute b in enq v
a=28-20
a=8.
the boy's age is 8.