I /......./+25
II /......./+33 } 233
II /......./+16
3 parti+25+33+16=233
3 parti+74=233
3 parti=233-74
3 parti=159
1 parte=159:3
1 parte=53
53 ari ara fiecare in mod egal
I a arat =53+25=78 ari
al II-lea a arat 53+33=86 ari
al III-lea a arat 53+16=69
proba 78+86+69=233 ari