Question
Warren has some gold and white balls. The total mass of all his balls is 240 g. He has 6 less gold balls than white balls. The average mass of the gold balls is 9 g. The average mass of the white balls is 12 g. How many balls does Warren have altogether?
3 m

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Warren has some gold and white balls. The total mass of all his balls is 240 g. He has 6 less gold balls than white balls. The average mass of the gold balls is 9 g. The average mass of the white balls is 12 g. How many balls does Warren have altogether?