A committee is reviewing a total of 30x 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 of the selected films are in color?  Pick:
A) 22/21
B) 20/21
C) 23/21
D) 25/21
E) 28/21
Say x=y=10. In this case we would have:   30x=300 black-and-white films;   6y=60 color films.   y/x%=10/10= 
<gadget id="calculator">10/10</gadget>
<output>1</output>
1% of the black-and-white films, so 3 black-and-white films and all 60 color films, thus total of 63 films were selected.   Color films thus compose 60/63=20/21 of the selected films.   Answer:20/21
<result>B</result>
A committee is reviewing a total of 30x 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 of the selected films are in color?