Question
Will has some black and green balls. The total mass of all his balls is 236 g. He has 4 more green balls than black balls. The average mass of the black balls is 5 g. The average mass of the green balls is 11 g. How many balls does Will have altogether?
3 m

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Will has some black and green balls. The total mass of all his balls is 236 g. He has 4 more green balls than black balls. The average mass of the black balls is 5 g. The average mass of the green balls is 11 g. How many balls does Will have altogether?