My brother lost 2 pebbles out of the 7 pebbles he collected from the river. How many pebbles are left with my brother?
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George has 6 crayons. 5 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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6 birds are sitting on a tree. 4 of them flew away. How many birds will be left on the tree?
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A fish tank has 7 fishes. 4 of them have red fins and others have blue fins. How many fishes have blue fins?
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Tim has 5 quarters less than Joanna. Joanna has 5 quarters. How many quarters does Tim have?
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