Question 728969
Let {{{ j }}} = Jen's age now
Let {{{ d }}} = Dave's age now
given:
{{{ j = 3d }}}
{{{ j - 8 = 5*( d - 8 ) }}}
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{{{ j - 8 = 5d - 40 }}}
By substitution,
{{{ 3d - 8 = 5d - 40 }}}
{{{ 2d = 32 }}}
{{{ d = 16 }}}
and
{{{ j = 3d }}}
{{{ j = 3*16 }}}
{{{ j = 48 }}}
Jen is 48