Question
The average number of cupcakes in Box K, Box L and Box M is 50. Box K has 20 cupcakes. The number of cupcakes in Box L is four times the number of cupcakes in Box M. What is the number of cupcakes in Box M?
2 m

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The average number of cupcakes in Box K, Box L and Box M is 50. Box K has 20 cupcakes. The number of cupcakes in Box L is four times the number of cupcakes in Box M. What is the number of cupcakes in Box M?