Question
Liam has some blue and gold balls. The total mass of all his balls is 180 g. He has 9 more gold balls than blue balls. The average mass of the blue balls is 4 g. The average mass of the gold balls is 8 g. How many balls does Liam have altogether?
3 m

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Liam has some blue and gold balls. The total mass of all his balls is 180 g. He has 9 more gold balls than blue balls. The average mass of the blue balls is 4 g. The average mass of the gold balls is 8 g. How many balls does Liam have altogether?