Question
There are 66 blue balls and 26 brown balls in a basket. 311 of the blue balls are defective. All the brown balls are not defective. How many more blue balls than brown balls are not defective?
4 m

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There are 66 blue balls and 26 brown balls in a basket. 311 of the blue balls are defective. All the brown balls are not defective. How many more blue balls than brown balls are not defective?