by minnie
(nj)
Early one morning Sandy took out onehalf of the coins from her coin bank, and in the evening she put in 20 coins. The next morning she took out onethird of the coins in the bank, and that evening she put in 4 coins. The next morning, she took out onehalf the coins in the bank, leaving 15 coins. How many coins were in the bank to begin with?
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