Folosim regula de trei simplă:
8.a) 1kg.........16,25lei
0,2kg.........x lei
x= 0,2×16,25:1=3,25:1=3,25lei
b)1kg.........16,25lei
2,8kg............x lei
x=2,8×16,25:1=45,5:1=45,5lei
c)1kg.........16,25 lei
3,6kg...........x lei
x=3,6×16,25:1=58,5:1=58,5lei
9.84,5km.........1h
xkm...........3,8h
x=3,8×84,5:1=321,1km
