George is 6 years older than his sister, and the sum of their ages is 68 years. How old is George? Answer:

Question

I dont know how to help plz

Answer 1

G = age of George

 

S = age of sister

 

G = S + 6,  i.e. G - S = 6

 

G + S = 68

 

Solve the system of equations:

 

G - S = 6

G + S = 68

 

Add the two equations and get

 

2G = 74

G = 37

 

Then S = G - 6 = 37 - 6 = 31