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10D + 25Q = 850 and D = 55 - Q

Substitute: 10(55 - Q) + 25Q = 850

ie 550 - 10Q + 25Q = 850

ie 15Q = 300

so Q = 20, making D = 35

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Q: A jar contains 55 quarters and dimes The total value of the coins is 8.50 How many quarters and dimes are there all together?
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