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If  Ada had u twenty-cent coins, he had 2u fifty-cent coins.

0.2u + 0.5*2u = 6

0.2u + u = 6

1.2u = 6      Divide both sides by 1.2

u = 5

So Ada had 5 twenty-cent coins.

 

 

Check : 0.2 * 5 + 0.5 * 10 = 1 + 5 = 6 Checked

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