Răspuns :
densitatea= masa ÷ volum
volum= l×L×h=20×15×2=600 cm3
masa= densitatea × volum= 8.9 g/cm3 ×600 cm3 => masa= 5340 g=5,34 kg
volum= l×L×h=20×15×2=600 cm3
masa= densitatea × volum= 8.9 g/cm3 ×600 cm3 => masa= 5340 g=5,34 kg