Bookman purchased 55 copies of a new book released recently, 10 of which are hardback and sold for $20 each, and rest are paperback and sold for $10 each. If 14 copies were sold and the total value of the remaining books was 460, how many paperback copies were sold? Answers: A) 10 B) 11 C) 12 D) 13 E) 9
The bookman had 10 hardback ad  55-10= 
<gadget id="calculator"> 55-10</gadget>
<output>45</output>
45 paperback copies;   14 copies were sold, hence  55-14= 
<gadget id="calculator"> 55-14</gadget>
<output>41</output>
41 copies were left. Let # of paperback copies left be p then 10p+20(41-p)=460 --&gt; 10 p=360 --&gt; p=36   # of paperback copies sold is 45-36= 
<gadget id="calculator">45-36</gadget>
<output>9</output>
9   Answer: 9
<result>E</result>
Bookman purchased 55 copies of a new book released recently, 10 of which are hardback and sold for $20 each, and rest are paperback and sold for $10 each. If 14 copies were sold and the total value of the remaining books was 460, how many paperback copies were sold?