1) (5/21+2/15)+2/21=5/21+2/21+2/15=7/21+2/15=21/105+14/105=35/105=1/3
2)(3/35+3/28)+1/28=3/28+1/28+3/35=4/28+3/35=20/140+12/140=32/140=8/35
3)(7/30+8/45)+(2/45+1/30)=7/30+1/30+8/45+2/45=8/30+10/45=24/90+20/90=22/45
4)(5/24+11/60)+(13/60+1/24)=6/24+24/60=30/120+48/120=78/120=13/20
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1) (5/21+2/15)+2/21=5/21+2/21+2/15=7/21+2/15=21/105+14/105=35/105=1/3
2)(3/35+3/28)+1/28=3/28+1/28+3/35=4/28+3/35=20/140+12/140=32/140=8/35
3)(7/30+8/45)+(2/45+1/30)=7/30+1/30+8/45+2/45=8/30+10/45=24/90+20/90=22/45
4)(5/24+11/60)+(13/60+1/24)=6/24+24/60=30/120+48/120=78/120=13/20