Question
Fabian has some green and black balls. The total mass of all his balls is 222 g. He has 2 more black balls than green balls. The average mass of the green balls is 3 g. The average mass of the black balls is 9 g. How many balls does Fabian have altogether?
3 m

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Fabian has some green and black balls. The total mass of all his balls is 222 g. He has 2 more black balls than green balls. The average mass of the green balls is 3 g. The average mass of the black balls is 9 g. How many balls does Fabian have altogether?