Bruce is 7 years old. Karen is 3 years old. Bruce is how many years older than Karen?
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There are 8 cookies in a plate. 2 kids took one cookie each from the plate. How many cookies are left in the plate?
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A fish tank has 7 fishes. 6 of them have red fins and others have blue fins. How many fishes have blue fins?
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8 birds are sitting on a tree. 8 of them flew away. How many birds will be left on the tree?
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Bill picked 9 strawberries from the farm and ate 9 of them. How many strawberries does Bill now have?
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