Respuesta :
Answer:
Gabrielle's age - 48
Step-by-step explanation:
Gabrielle's age is three times Mikhail's age.
G = 3M
The sum of their ages is 64.
G + M = 64 :
Replace G with 3M
3M + M = 64
4M = 64
M = 16 :
What is Gabrielle's age?
G = 3(16)
G = 48