100% – 45% = 55%

20% = 1/5

Male G: Female G: Total G: Sold MG: Left MG: Left FG: Sold FG

   45     :      55        :  100     :      9        :     36      :     54      :    1

                                                     (?)                                           (7)

   5       :                                         1         :     4                                               x9

                                                                        2       :       3                             x18

Make male guppies same number of units.

Make left male guppies same number of units.

55u – 54u = 1u (sold female guppies)

1u = 7

9u = 9 x 7

     = 63