Răspuns:
Explicație pas cu pas:
al patrulea a luat 8 paini
5/5-1/5=4/5(8 paini)
5/5=8:4x2=10
1/5=2x1=2
al treilea a luat 2 paini
2/2-1/2=10
2/2=10x2=20
20-10=10 paini
al doilea a luat 10 paini
3/3-1/3=2/3
2/3=10+2+8=20
1/3=20:2=10
primul a luat 10 paini