Question 144468
Let a be the man's age now. Let b be the brother's age now

{{a + b = 48}}

We are also told that 12 years ago the man was 5 times as old as his brother. So
{{{(a-12) = 5(b-12)}}}
{{{a - 12 = 5b - 60}}}
{{{a + 48 = 5b }}}
{{{(a+48)/5 = b }}}

Use that value for b in the original equation
{{a + b = 48}}
{{{a + (a+48)/5 = 48 }}}
{{{5a + a + 48 = 240 }}}
{{{6a = 192}}}
{{{a = 32}}}

So b = 48-32 = 16