A fish tank has 5 fishes. 5 of them have red fins and others have blue fins. How many fishes have blue fins?
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Don picked 9 strawberries from the farm and ate 7 of them. How many strawberries does Don now have?
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Don has 3 dollars more than Joanna. Joanna has 6 dollars. How many dollars does Don have?
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Bill has 7 crayons. 3 of them are in the green box and the others are in the red box. How many crayons are in the red box?
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There are 6 cookies in a plate. 4 kids took one cookie each from the plate. How many cookies are left in the plate?
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