Question
Luis has some yellow and gold balls. The total mass of all his balls is 201 g. He has 9 more gold balls than yellow balls. The average mass of the yellow balls is 8 g. The average mass of the gold balls is 13 g. How many balls does Luis have altogether?
3 m

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Luis has some yellow and gold balls. The total mass of all his balls is 201 g. He has 9 more gold balls than yellow balls. The average mass of the yellow balls is 8 g. The average mass of the gold balls is 13 g. How many balls does Luis have altogether?