Question
Pierre has some green and pink balls. The total mass of all his balls is 185 g. He has 5 less green balls than pink balls. The average mass of the green balls is 3 g. The average mass of the pink balls is 7 g. How many balls does Pierre have altogether?
3 m

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Pierre has some green and pink balls. The total mass of all his balls is 185 g. He has 5 less green balls than pink balls. The average mass of the green balls is 3 g. The average mass of the pink balls is 7 g. How many balls does Pierre have altogether?