1/3 +1/6 + 1/12= ?? 1/20+1/5+1/6= ? 5/12+1/6+1/4=?

1/3+1/6+1/12=4/12+2/12+1/12=8/12=2/3
1/20+1/5+1/6=3/60+12/60+10/60=25/60=5/12
5/12+1/6+1/4=5/12+2/12+3/12=10/12=5/6