subash can copy 50 pages in 10 hrs.subash and prakash together can copy 300 pages in 40 hours.in how much time prakash can copy 20 pages.
Pick one.
A) 8
B) 10
C) 12
D) 14
E) 16
subhas 's 1 hr copy page=50/10= 
<gadget id="calculator">50/10</gadget>
<output>5</output>
5 page   (subhas+prakash)'s 1 hr copy page=300/40= 
<gadget id="calculator">300/40</gadget>
<output>15/2 = around 7.5</output>
7.5 page   from above prakash's 1 hr copy page= 2.5 page   so time taken in 20 page's copy =(20/2.5)= 
<gadget id="calculator">(20/2.5)</gadget>
<output>8</output>
8 hrs   8NSWER :8
<result>A</result>
subash can copy 50 pages in 10 hrs.subash and prakash together can copy 300 pages in 40 hours.in how much time prakash can copy 20 pages.