Answer:
26
Step-by-step explanation:
Devaughn = 2x
Sydney = x
x + 2x = 78
3x = 78
x = 78 / 3
x = 26
Hope that helps!
Lets say Devaughn age = d and Sydney age = s
Therefore,
d = 2s
and s + d = 78
Well, we can use substitution for d.
s + (2s) = 78
3s = 78
s = 26
