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Cindy can bake a certain number of cakes in 5 hours. Bella can bake the same number of cakes in 4 hours.
(a) In 4 hours, Bella can bake 30 cakes. How many cakes can Cindy bake in 4 hours?
(b) How long will it take both girls to bake a total of 108 cakes ?
Notes to student: