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Mathematics 9 Online
OpenStudy (anonymous):

Anne has 100 coins in her savings box. There were 10-cent, 20-cent and 50-cent coins. First, he replaced all his 20-cent coins with 50-cent coins and there were 73 coins in the savings box. Then he replaced all his 10-cent coins with 50-cent coins and there were 33 coins left in the savings box. How many 50-cent coins were there in the savings box. Ah, I seem to be at a lost again. :( Help?

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