Alex and Alicia are twins. Kevin is 5 years older than the twins. Their ages total 53. How old are the twins?

Let 2a=Alex and Alicia's age and a=Alex or Alicia's age

And k=Kevin's age

a+5=k

2a+k=53

And to solve use substitution since we already know what k is

2a + (a+5) = 53

2a+a+5=53

3a+5=53

3a=48

a=16

And just in case you wanted to know if needed it

16+5=k

21=k

Alex is 16, Alicia is 16 and Kevin is 21