Xiaoying family has 54 chickens, ducks and geese, of which 49 are chickens. The ratio of ducks to geese is 3:2. How many ducks and geese do they have?

54 × (1-49) = 54 × 59 = 30, 30 × 32 + 3 = 18, 30-18 = 12 A: there are 18 ducks and 12 geese

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