Respuesta :
Answer:
The numbers are 70,30,20.
Step-by-step explanation:
Let the three numbers be 7x,3x and 2x.
The sum of smallest and largest number is 7x+2x=9x.
According to question:
9x-30=2(3x)
Simplifying the equation:
9x-30=6x
Adding 30 both sides:
9x=6x+30 or,9x-6x=30
3x=30, x=10,
The numbers are 7x=7(10)=70
3x=3(10)=30
2x=2(10)=20.