A committee is reviewing a total of 20x black-and-white films and 6y color films for a festival. If the committee selects y/x% of the black-and-white films and all of the color films, what fraction R of the selected films are in color? Select
A) 1/130 B) 1/5 C) 3/13 D) 10/13 E) 30/31
It's y/xpercentnot y/x.   If x=20 and y=10. Then:   20x=400 black-and-white films;   6y=60 color films.   y/x%=10/20= 
<gadget id="calculator">10/20</gadget>
<output>1/2 = around 0.5</output>
0.5% of the black-and-white films, so 2 black-and-white films and all 60 color films, thus total of 62 films were selected.   Color films thus compose R=60/62=30/31 of the selected films.   Answer: 30/31.
<result>E</result>
A committee is reviewing a total of 20x black-and-white films and 6y color films for a festival. If the committee selects y/x% of the black-and-white films and all of the color films, what fraction R of the selected films are in color?