Question 954957
Let {{{ x }}} = the age of the youngest one
Their ages are:
{{{ x }}}, {{{ x + 3 }}}, {{{ x + 6 }}}, {{{ x + 9 }}}, {{{ x + 12 }}}
and {{{ x + 15 }}}
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{{{ x + x + 3 + x + 6 + x + 9 + x + 12 + x + 15 = 81 }}}
{{{ 6x + 45 = 81 }}}
{{{ 6x = 36 }}}
{{{ x = 6 }}}
The youngest is 6
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check:
Their ages are:
{{{ 6 + 9 + 12 + 15 + 18 + 21 = 81 }}}
{{{ 81 = 81 }}}
OK