Question
Charlie has some yellow and green balls. The total mass of all his balls is 189 g. He has 6 less yellow balls than green balls. The average mass of the yellow balls is 3 g. The average mass of the green balls is 6 g. How many balls does Charlie have altogether?
3 m

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Charlie has some yellow and green balls. The total mass of all his balls is 189 g. He has 6 less yellow balls than green balls. The average mass of the yellow balls is 3 g. The average mass of the green balls is 6 g. How many balls does Charlie have altogether?