John dana and douglas painted a room they have combined effort so john+dana+douglas=total room
total room=100%=1/1=1 so 1 whole=8/8 so 2/8 is painted by john so they don't need to paint that so so 2/8+dana+douglas=8/8 subtract 2/8 frm both sides dana+dogluas=(8-2)/8=6/8 dana+douglas=6/8 dana painted same as douglas so divide by 2 dana=douglas=3/8
so A is 6/8 or 3/4 B is 2/8+3/8+3/8=8/8 or 2/8+dana+douglas=8/8
