Answer:
65 years old.
Step-by-step explanation:
Set up variables first:
[tex]U = 4A\\A = A\\U+ A = 65[/tex]
U is the Uncle, A is Alex.
Substitiute U for the last equation.
[tex]4A + A = 65[/tex]
Solve:
[tex]5A = 65\\A = 13[/tex]
This means that Alex is 13 years old.
This also means that the Uncle is 52 years old.
Together they are 65 years old.
Hope this Helps!
Plz mark as brainliest.