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 360, how many paperback copies were sold?
Select
A) 8
B) 10
C) 12
D) 19
E) 16
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)=560 --&gt; 10 p=260 --&gt; p=26   # of paperback copies sold is 45-26= 
<gadget id="calculator">45-26</gadget>
<output>19</output>
19   Answer: 19
<result>D</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 360, how many paperback copies were sold?