Tom read a book containing 480 pages by reading the same number of pages each day. If he would have finished the book 5days extra by reading 10 pages a day less, how many days did Tom spend reading the book?
Choices
A) 13
B) 15
C) 14
D) 13.19
E) 16
Actually u can set up 2 equation   P--stands for the pages   D--stands for the days   1) P*D=480 (we want to find the Days, soP=480/D)   2) (P-10)(D+5)=480 =&gt; PD+5P-10D-50=480   as the 1) stated u can put 1) into 2)   =&gt; 480+5P-10D-50=480 =&gt; 5P-10D=50   put the bold one into it =&gt; 5*480/D-10D=50   the we get the final equation 2400/D-10D=50   =&gt; D^2+5D-240=0   (D-15)(D+10)=0 so D=13.19days. Ans: 13.19
<result>D</result>
Tom read a book containing 480 pages by reading the same number of pages each day. If he would have finished the book 5days extra by reading 10 pages a day less, how many days did Tom spend reading the book?