Question
Albert has some blue and brown balls. The total mass of all his balls is 227 g. He has 4 more brown balls than blue balls. The average mass of the blue balls is 7 g. The average mass of the brown balls is 8 g. How many balls does Albert have altogether?
3 m

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Albert has some blue and brown balls. The total mass of all his balls is 227 g. He has 4 more brown balls than blue balls. The average mass of the blue balls is 7 g. The average mass of the brown balls is 8 g. How many balls does Albert have altogether?