Question 256879
Let N = nathan, C = Conner, J = Josh
C + 2 = (1/2)Josh.
Josh is 12, so
C + 2 = (1/2)*12 = 6
So, Conner is 4.  
Conner is 4 and josh is 12.
C + a = (1/2)(J + a)
4 + a = (1/2)(12 + a)
4 + a = 6 + (1/2)a
2 = (3/2)a
4 = a.
In 4 years c = 1/2 josh age