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A bird park has some parrots, magpies and ostriches.
The ratio of the number of parrots to the total number of birds in the park is 4 : 11.
There are 80 magpies and 46 ostriches in the park.
(a) Find the ratio of the number of parrots to the number of ostriches in the bird park.
(b) Calculate the ratio of the number of magpies to the total number of birds in the bird park.
Notes to students: