Question
Michael has some brown and blue balls. The total mass of all his balls is 228 g. He has 6 less brown balls than blue balls. The average mass of the brown balls is 7 g. The average mass of the blue balls is 11 g. How many balls does Michael have altogether?
3 m

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Michael has some brown and blue balls. The total mass of all his balls is 228 g. He has 6 less brown balls than blue balls. The average mass of the brown balls is 7 g. The average mass of the blue balls is 11 g. How many balls does Michael have altogether?