Question
Ivan has some yellow and blue balls. The total mass of all his balls is 250 g. He has 5 less yellow balls than blue balls. The average mass of the yellow balls is 4 g. The average mass of the blue balls is 6 g. How many balls does Ivan have altogether?
3 m

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Ivan has some yellow and blue balls. The total mass of all his balls is 250 g. He has 5 less yellow balls than blue balls. The average mass of the yellow balls is 4 g. The average mass of the blue balls is 6 g. How many balls does Ivan have altogether?