<PRE><B>Question 624666</B>
Uzma is {{{ 15 }}}
Asma is {{{ 15 + 15/3 = 20 }}}
Let {{{ x }}} = the number of  years ago when asma was twice as old as uzma
{{{ 20 - x = 2*( 15 - x ) }}}
{{{ 20 - x = 30 - 2x }}}
{{{ x = 30 - 20 }}}
{{{ x = 10 }}}
10 years ago, asma was twice as old as uzma
check answer:
10 years ago, Asma was {{{ 20 - 10 = 10 }}}
10 years ago, Uzma was {{{ 15 - 10 = 5 }}}
OK</PRE>