Respuesta :

Answer:

  5, 20, 35

Step-by-step explanation:

Let x represent the first number. The given relation is ...

  x + 4x + (4x+15) = 60

  9x = 45 . . . simplify, subtract 15

  x = 5 . . . . . .divide by 9

The three numbers are 5, 20, 35.