how many trays of chocolate doughnuts did they sell?

Question

Yesterday, Cora's Doughnut Shop sold 1 9/10 times as many chocolate doughnuts as cinnamon doughnuts. If they sold 1/2 of a tray of cinnamon doughnuts, how many trays of chocolate doughnuts did they sell?

Answer 1

Translate:

  "sold 1 9/10 times as many chocolate doughnuts as cinnamon doughnuts"

    (1 9/10)       *                                                                  (1/2 tray)

re-write:

     (1 9/10)*((1/2 tray)

     (19/10)*(1/2) tray                    [convert mixed number to improper fraction]

     (19/20) tray                            [multiply numerators and denominators]