The number of geese in the farm is 5 / 6 of that of chickens and 2 / 5 of that of ducks. The number of geese in the farm is 900?

The number of geese in the farm is 5 / 6 of that of chickens and 2 / 5 of that of ducks. The number of geese in the farm is 900?

Chicken: 900 * 2 / 5 = 360
Geese: 360 * 5 / 6 = 300