Respuesta :

Ray is 23 years older than his sister carol."
r = c+23

"In 20 years he will be twice as old as Carol."
r+20 = 2(c+20)
(c+23)+20 = 2(c+20)
c+43 = 2c+40
c = 3
r = c+23 = 26

I hope that helped