<PRE><B>Question 735993</B>
Let {{{ p }}} = number of puppies
Let {{{ d }}} = number of dogs
( 6p ) / ( 1 can ) = ( 2d ) / ( 1 can )
or
( 1 p ) / ( 1/6 can ) = ( 1 d ) / ( 1/2 can )
---------------------
{{{ 21p / ( 21/6 ) = d / (1/2) }}}
{{{ 10 - 21/6 = 20/2 - 7/2 }}}
{{{ 13/2 }}} cans are left
{{{ (13/2)*( d / (1/2) ) = 13d }}}
13 dogs can be fed with remaining 6.5 cans
check:
( 1 p ) / ( 1/6 can ) = ( 1 d ) / ( 1/2 can )
( 21p / ( 7/2 can ) = ( 13d ) / ( 13/2 can )
( 6p ) / ( 1 can ) = ( 2d ) / ( 1 can )
OK
</PRE>