Question
Harry has some grey and purple balls. The total mass of all his balls is 193 g. He has 9 more purple balls than grey balls. The average mass of the grey balls is 6 g. The average mass of the purple balls is 7 g. How many balls does Harry have altogether?
3 m

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Harry has some grey and purple balls. The total mass of all his balls is 193 g. He has 9 more purple balls than grey balls. The average mass of the grey balls is 6 g. The average mass of the purple balls is 7 g. How many balls does Harry have altogether?