Question
Will has some brown and pink balls. The total mass of all his balls is 215 g. He has 5 less brown balls than pink balls. The average mass of the brown balls is 3 g. The average mass of the pink balls is 7 g. How many balls does Will have altogether?
3 m

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Will has some brown and pink balls. The total mass of all his balls is 215 g. He has 5 less brown balls than pink balls. The average mass of the brown balls is 3 g. The average mass of the pink balls is 7 g. How many balls does Will have altogether?