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In January, the ratio of the number of male to female tailors in a garment factory was 4 : 3.
The following month, 80 more female tailors joined the factory.
Then, the ratio of the number of female to male tailors became 2 : 1.
(a) How many male tailors were there in January?
(b) How many female tailors were there in the end?
Notes to students: