Question
Nick has some green and brown balls. The total mass of all his balls is 230 g. He has 2 less green balls than brown balls. The average mass of the green balls is 4 g. The average mass of the brown balls is 10 g. How many balls does Nick have altogether?
3 m

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Nick has some green and brown balls. The total mass of all his balls is 230 g. He has 2 less green balls than brown balls. The average mass of the green balls is 4 g. The average mass of the brown balls is 10 g. How many balls does Nick have altogether?