Question 1122574
Let {{{ a }}} = the grandson’s age
Freddy’s age is {{{ 8a + 4 }}}
Let the sum of their ages be {{{ 67 }}}
{{{ a + 8a + 4 = 67 }}}
{{{ 9a = 63 }}}
{{{ a = 7 }}}
The youngest the grandson can be is 7