Step-by-step explanation:
let's name the variables for the age of the people as the people themselves :
orlando = omar + 12
carl = 3×orlando
carl + orlando + omar = 68
using the first equation in the second equation, and then that result and the first equation in the third equation :
carl = 3×(omar + 12)
3×(omar + 12) + (omar + 12) + omar = 68
3×omar + 36 + omar + 12 + omar = 68
5×omar + 48 = 68
5×omar = 20
omar = 4
orlando = omar + 12 = 4 + 12 = 16
carl = 3×orlando = 3×16 = 48
the ratio omar : carl : orlando
4 : 48 : 16 = 1 : 12 : 4