Tom read a book containing 100 pages by reading the same number of pages each day. If he would have finished the book 10 days earlier by reading 30 pages a day more, how many days did Tom spend reading the book?
Choose the most appropriate option:	A) 7	B) 7.68	C) 8	D) 9	E) 10
Actually u can set up 2 equation   P--stands for the pages   D--stands for the days   1) P*D=100 (we want to find the Days, soP=100/D)   2) (P+30)(D-10)=100 =&gt; PD-10P+30D-300=100   as the 1) stated u can put 1) into 2)   =&gt; 100-10P+30D-300=100 =&gt; 30D-10P=100   put the bold one into it =&gt; 30D-10(100/D)=100   the we get the final equation 30D^2-1000=100D (divide 16)   =&gt; D^2-5D-150=0   (D-15)(D+10)=0 so D=7.68 days. Ans:( 7.68)
<result>B</result>
Tom read a book containing 100 pages by reading the same number of pages each day. If he would have finished the book 10 days earlier by reading 30 pages a day more, how many days did Tom spend reading the book?