4) 1*3*5=15 cm3 - v cutiei
15 cm3 / 50 = 0.30 cm3 - v 1 chibrit in cm3
0.30*1000=300mm3 v1 chibrit in mm3
6) 30*30=900cm3 -v total
2*2=4cm3 - v unei bucati
900/4=225 de bucati
7) 4*4*4=64 m3 => 64000 litri deoarece 1 m3 = 1000 litri
4*4=16m2 => Aria totala=16*4=64m2= 100g*64m2=6400g=6.4kg vopsea