Question
Seth has some red and silver balls. The total mass of all his balls is 210 g. He has 10 more silver balls than red balls. The average mass of the red balls is 7 g. The average mass of the silver balls is 13 g. How many balls does Seth have altogether?
3 m

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Seth has some red and silver balls. The total mass of all his balls is 210 g. He has 10 more silver balls than red balls. The average mass of the red balls is 7 g. The average mass of the silver balls is 13 g. How many balls does Seth have altogether?