Question 1038374
Let {{{ a }}} = the age of the youngest child
{{{ a + (a + 1) + (a + 2) + (a + 3) + (a + 4) = 15 }}}
{{{ 5a + 10 = 15 }}}
{{{ 5a = 5 }}}
{{{ a = 1 }}}
and
{{{ a + 4 = 5 }}}
The oldest child is 5
-------------------
check:
{{{ 1 + 2 + 3 + 4 + 5 = 15 }}}
{{{ 15 = 15 }}}
OK