Question 1008000
Its a 4 digit number
The hundreds are 3 times the ones 
The thousands are double the tens
The sum of the digits is 24
let one place x than hundred place will be 3x
let tens place is y than thousand place will be 2y
as per give conditions  2y+3x+y+x=24
3y+4x=24  we should take pair of x any such that  sum should be 24
pair of 1 and2 not satisfy 
pair of 2 and 3 not satisfy 
pair of 3 and 4 satisfy means  x=3 and y=4  (3x4+4x3=12+12=24)
so number will be 8943