Question
Luke strings some gold and black crystals to make a necklace. For every 2 gold crystals Luke uses, he uses 5 black crystals. He uses a total of 84 gold and black crystals for the necklace. How many more black crystals than gold crystals does he use?
4 m

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Luke strings some gold and black crystals to make a necklace. For every 2 gold crystals Luke uses, he uses 5 black crystals. He uses a total of 84 gold and black crystals for the necklace. How many more black crystals than gold crystals does he use?