Rick deposited $650 to his bank account using $5 and $15 dollar bills only. If Rick came to the bank with 70 bills and left with 10 bills only, how many $15 dollar billsმ did he deposit? Options:  A) 5.  B) 25.  C) 50.  D) 35.  E) 65.
5x+15y=650 --1   x+y=60 ---2   multiply eq 2 with 5 and subtract from eq 1   5x+15y=650   5x+5y=300   10y= 350   y=35 and x = 25   therefore $15 bills = 35   Answer 35.
<result>D</result>
Rick deposited $650 to his bank account using $5 and $15 dollar bills only. If Rick came to the bank with 70 bills and left with 10 bills only, how many $15 dollar billsმ did he deposit?