Question 1106251
Let {{{ x }}} = amount he had at first
He had {{{ x - 682 }}} after buying pendant
Then he spent 1/10 of that, so he had 9/10
left, so, he has left
{{{ ( 9/10 )*( x - 682 ) }}}
and you are told he has:
{{{ ( 9/10 )*( x - 682 ) = ( 3/7)*x }}}
Multiply both sides by {{{ 70 }}}
{{{ 63*( x - 682 ) = 30x }}}
{{{ 63x - 63*682 = 30x }}}
{{{ 33x = 63*682 }}}
{{{ x = (21/11 )*682 }}}
{{{ x = 21*62 }}}
You can finish