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A system. X = nickles and Y = dimes. all money changed to pennies for convenience.

- 5(X + Y = 25)

5X + 10Y = 165

- 5X - 5Y = - 125

5X + 10Y = 165

----------------------------add

5Y = 40

Y = 8

======so (25 - 8 = 17)

X = 17

============

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