Question
Ivan has some purple and black balls. The total mass of all his balls is 240 g. He has 6 more black balls than purple balls. The average mass of the purple balls is 8 g. The average mass of the black balls is 16 g. How many balls does Ivan have altogether?
3 m

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Ivan has some purple and black balls. The total mass of all his balls is 240 g. He has 6 more black balls than purple balls. The average mass of the purple balls is 8 g. The average mass of the black balls is 16 g. How many balls does Ivan have altogether?