Question
Carl has some brown and blue balls. The total mass of all his balls is 240 g. He has 6 more blue balls than brown balls. The average mass of the brown balls is 5 g. The average mass of the blue balls is 13 g. How many balls does Carl have altogether?
3 m

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Carl has some brown and blue balls. The total mass of all his balls is 240 g. He has 6 more blue balls than brown balls. The average mass of the brown balls is 5 g. The average mass of the blue balls is 13 g. How many balls does Carl have altogether?