<human>:  Hannah is making banana bread. She needs to use 3 cups of flour for every cup of banana mush. It takes 4 bananas to make one cup of mush. If Hannah uses 20 bananas, how many cups of flour should she use?
<bot>: How many cups of banana mush does Hannah get? ** First find the number of cups of banana mush Hannah gets: 20 bananas / 4 bananas/cup = <<20/4=5>>5 cups
How many cups of flour does Hannah need? ** Then multiply the number of cups of mush by the ratio of flour to mush to find the number of cups of flour: 5 cups mush * 3 cups flour/1 cup mush = <<5*3=15>>15 cups flour
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