Question
There were 41 kids in a fast food restaurant. Every kid ordered at least one type burger. Mr Choy received order for 20 cheese burgers and 30 beef burgers. How many kids ordered the beef burger only?
4 m

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There were 41 kids in a fast food restaurant. Every kid ordered at least one type burger. Mr Choy received order for 20 cheese burgers and 30 beef burgers. How many kids ordered the beef burger only?