Answer:
72
Step-by-step explanation:
Let Ivan's current age be g and his son's current age by s.
Then g - 18 = 3(s - 18), and
g = 2s
Substituting 2s for g in the first equation, we get:
2s - 18 = 3s - 54
Grouping like terms, we get:
36 = s.
Thus, Ivan's son's age now is 36 years; Ivan is twice that, or 72 years.
