Question
There are 55 black balls and 31 yellow balls in a basket. 311 of the black balls are damaged. All the yellow balls are not damaged. How many more black balls than yellow balls are not damaged?
4 m

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There are 55 black balls and 31 yellow balls in a basket. 311 of the black balls are damaged. All the yellow balls are not damaged. How many more black balls than yellow balls are not damaged?