Ben and Michael are brothers
Let B represents Ben age
Let M represents Michael age
B = 4M
[tex]\begin{gathered} B\text{ + M = 25} \\ 4M\text{ + M = 25} \\ 5M\text{ = 25} \\ M\text{ = }\frac{25}{5} \\ M\text{ = 5yrs} \end{gathered}[/tex]Michael age = 5yrs
Ben = 4M
Therefore Ben age = 4 x 5 yrs
Ben = 20yrs
Hence the age of Ben = 20yrs
