45+38+5+2=(45+5)+(38+2)=50+40=90
6+27+14+3=(6+16)+(27+3)=20+30=50
17+6+34+3=(17+3)+(6+34)=20+40=60
25+8+5+42=(25+5)+(8+12)=30+20=50
12+19+8+1=(12+8)+(19+1)=20+20=40
16+17+4+3(16+4)+(17+3)=20+20=40
13+55+5+7=(13+7)+(55+5)=20+60=80
9+4+31+56=(9+31)+(4+56)=40+60=100