Question

cris can makea chair in 12 days and billy in 18 days. they work together to make a chair for 6 days. what fraction of work is left??

Answer 1

c--12,,,b--18,,,so lcm is work 72
c,d individual efforts per day 72/12,72/18i.e is 6,4 respectively.but they do 6 days so 6*(6+4)=60
72-60=12 is the remaining work..12/72=>1/6 left