Question

Bryn's age is given by the expression 3g - 7, where g is her sister Gabriela's age. If Bryn is 17, how old is Gabriela?

Answer 1

3g - 7 = 17
3g = 17 + 7
3g = 24
g = 24/3
g = 8

Gabriela is 8 years old

Answer 2

17=3g-7
+7|    +7
24/3=3g/3
8=g
Gabriela is 8 years old.