Question 1129423
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Put aside that three extra $5 bills.


Then you have an updated collection of equal number of $5 and $20 dollars bills, and this collection is worth  265 - 15 = 250 dollars.


Now you can group $5 and $20 dollar bills in sets containing one $5-dollar bill and one $20-dollar bill.


Each set is worth $25, and the number of sets is  {{{250/25}}} = 10.


So, the original collection contains  10  of $20-dollar bills and  10+3 = 13 of $5-dollar bills.     <U>ANSWER</U>
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Solved.