Question 1015594
Let M = age of maria, R = age of Ralph, and {{{R[i]}}} = age of Richard.

From the 1st sentence, we get M = R + 5.
From the 2nd sentence, we get {{{R[i] = 2R}}}, and 
from the 3rd sentence, we get {{{M + R + R[i] = 65}}}.

Substituting the first two equations into the 3rd equation, we get

R + 5 + R + 2R = 65

4R = 60.  ==> R = 15, Ralph's age.

==> M = R + 5 = 15 + 5 = 20, Maria's age.
and {{{R[i] = 2R}}} = 30, Richard's age.