Question
Warren has some red and gold balls. The total mass of all his balls is 212 g. He has 6 more gold balls than red balls. The average mass of the red balls is 9 g. The average mass of the gold balls is 10 g. How many balls does Warren have altogether?
3 m

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Warren has some red and gold balls. The total mass of all his balls is 212 g. He has 6 more gold balls than red balls. The average mass of the red balls is 9 g. The average mass of the gold balls is 10 g. How many balls does Warren have altogether?