Question
John has some white and black beads. The total mass of all his beads is 236 g. He has 4 more black beads than white beads. The average mass of the white beads is 10 g. The average mass of the black beads is 13 g. How many beads does John have altogether?
3 m

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John has some white and black beads. The total mass of all his beads is 236 g. He has 4 more black beads than white beads. The average mass of the white beads is 10 g. The average mass of the black beads is 13 g. How many beads does John have altogether?