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If Andrew has u five dollar notes, he has 6u twenty-cent coins.

5u + 0.2 * 6u = 55.80

5u + 1.2u = 55.8

6.2u = 55.8

u = 9

So Andrew has 9 five dollar notes.

 

Check 5*9 + 0.2 * 6 * 9 = 45 + 10.8 = 55.8 Checked 

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