Question 253475
let the numbers be a,b,c
given,
           a=2b+4  ------------- 1
           c=2a    ------------- 2
           a+b+c=54------------- 3

from 2, a+b+2a=54
     => 3a+b=54 ------4
  using 1 in 4
      
    6b+12+b=54
  =>7b=42
  =>b=6

so, a=16
    c=32

ans: a=16, b=6, c=32