The age of Sydney is 25 years old
Solution:
Given that Devaughn is 7 years older than Sydney
The sum of their ages is 57
Let the age of Sydney be "x"
Then according to given information,
Age of Devaughn = x + 7
Now, Sum of Sydney age and Devaughn age = 57
Substituting the values we get,
x + x + 7 = 57
2x + 7 = 57
2x = 57 - 7
2x = 50
x = 25
"x" represents age of Sydney. Hence Sydney's age is 25 years old