<human>:  42 raspberries, blackberries, and blueberries were picked in total. If half of all the berries had been raspberries, and a third of the berries were blackberries, how many of them were blueberries?
<bot>: How many raspberries were picked? ** 42/2 = <<42/2=21>>21 raspberries had been picked.
How many blackberries were picked? ** 42/3 = <<42/3=14>>14 blackberries had been picked.
How many raspberries and blackberries were picked? ** 21+14 = <<21+14=35>>35 raspberries and blackberries had been picked.
How many of the berries were blueberries? ** 42-35 = <<42-35=7>>7 blueberries had been picked.
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