31+8= 20+39= 36-24= 65-35=
28+60= 54+22= 48-40= 54+30=
75-32= 72-40= 62+24= 83-31=
23+25= 36+23= 89-34= 22+75=
54-13= 42+45= 76+20= 44+50=
