Need explanation for this question, the answer is $175, but i got $265 instead.
In a piggy bank, there were 80 more $2-note than $1-coin. When 15 $2-note were swapped for the same number of $1-coin, the number of $2-note became twice the number of $1-coin in the piggy bank. How much money was there in the piggy bank at first?
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