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

You are told that B=3g-7  and you are also told that B=17 so

3g-7=17  add 7 to both sides

3g=24  divide both sides by 3

g=8

So Gabriela is 8 years of age.