the ratio of type of pen and type of notebook is 5:4.and in 80 ways one can start writing.tell me the no. of pen and no. of notebook.  Pick one:  A) 6,12  B) 10,6  C) 10,8  D) 8,4  E) 6,8
let the ratio constant be x.   no. of pen=5x,no. of notebook =4x.   total no. of ways of start writing=5x*4x=20(square of x)5 *4= 
<gadget id="calculator">5 *4</gadget>
<output>20</output>
20(square of x)=80   x=âˆš4=2   pen=10,notebook=8   answer 10,8
<result>C</result>
the ratio of type of pen and type of notebook is 5:4.and in 80 ways one can start writing.tell me the no. of pen and no. of notebook.