Explicație pas cu pas:
1) oi=1/3
vaci=4+x
capre=x
oi=1/3*111=111/3=37 oi
4+x+x=111-37
4+2x=74
2x=70
x=35 capre
vaci=x+4
vaci=35+4=39 vaci
2). 1/4*36=36/4=9lei (stiloul)
2/3*27=54/3=18 lei (caiete)
Răspuns: 36-(9+18)
36-27=9 lei
3). 1/6*36=36/6=6 timbre Anei
1/5*30=30/5=6 timbre Mariei
36-12+7=24+7=31 timbre acum
4). Răspuns: 100%-(50%+20%)=
100%-70%=30%
