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Kelly has twice as many CDs as Lou. Tiffany has three times as many CDs as Lou. Altogether they have 372 CDs. How many more CDs does Tiffany have than Lou?

2 answers

x = # Lou's CDs, then 2x = Kelly's and 3x = Tiffany's.

x + 2x + 3x = 372

Solve for x.

3x - x = ?

x+0
2x+93
3x+186

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