Question
Gabriel has some yellow and blue balls. The total mass of all his balls is 186 g. He has 9 more blue balls than yellow balls. The average mass of the yellow balls is 6 g. The average mass of the blue balls is 10 g. How many balls does Gabriel have altogether?
3 m

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Gabriel has some yellow and blue balls. The total mass of all his balls is 186 g. He has 9 more blue balls than yellow balls. The average mass of the yellow balls is 6 g. The average mass of the blue balls is 10 g. How many balls does Gabriel have altogether?