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Work in cents...

10D + 25Q = 675 and D = Q + 8

Substitute: 10(Q + 8) + 25Q = 675

ie 10Q + 80 + 25Q = 675

ie 35Q = 595

so Q = 17, making D = 25

Q: 6.75 in quarters and dimes he has 8 more dimes than quarters how many dimes and quarters does Ben have?

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