Respuesta :

Let d represent the amount of days needed to collect 54 1/3 cups of sugar:
15 2/3 + 3 1/3 d = 54 1/3

Subtract 15 2/3 from 54 1/3
3 1/3 d = 38 2/3

Divide 38 2/3 by 3 1/3

11 3/5

Rounded: 12 days!