Question
Mark has some gold and yellow balls. The total mass of all his balls is 200 g. He has 2 less gold balls than yellow balls. The average mass of the gold balls is 8 g. The average mass of the yellow balls is 10 g. How many balls does Mark have altogether?
3 m

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Mark has some gold and yellow balls. The total mass of all his balls is 200 g. He has 2 less gold balls than yellow balls. The average mass of the gold balls is 8 g. The average mass of the yellow balls is 10 g. How many balls does Mark have altogether?