Question 994204
{{{ d = c + 27 }}}
{{{ c/d = 4/7 }}}
{{{ c = ( 4/7 )*d }}}
{{{ c = ( 4/7)*( c + 27 ) }}}
{{{ c = ( 4/7)*c + 108/7 }}}
{{{ ( 3/7)*c = 108/7 }}}
{{{ 3c = 108 }}}
{{{ c = 36 }}}
There are 36 cats
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check:
{{{ d = c + 27 }}}
{{{ d = 36 + 27 }}}
{{{ d = 63 }}}
and
{{{ c/d = 4/7 }}}
{{{ 36/63 = 4/7 }}}
Divide top and bottom of left side by {{{ 9 }}}
{{{ 4/7 = 4/7 }}}
OK