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An apartment building has a total of 350 flats consisting of 1, 2, 3 and 4 bedrooms.
40% of the flats have 1 bedroom.
30% of the flats have 2 bedrooms.
65 flats have 3 bedrooms.
(a) How many flats in the apartment have 4 bedrooms?
(b) If the number of 3 bedroom flats in the building were to be increased by 5, what percentage of the total flats in the buliding would comprise of 4 bedroom flats?
Notes to student: