问题描述：
How many blue cubes are in the bag?
In a bag,there are red and blue cubes in the ratio 4：7.
I add 10 more red cubes to thebag.
Now there are red and blue cubes in the ratio 6：7.
In a bag,there are red and blue cubes in the ratio 4：7.
I add 10 more red cubes to thebag.
Now there are red and blue cubes in the ratio 6：7.
问题解答：
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