Question

O cutie cu 5 bile cantareste 350 grame ,iar cutoa cu 7 bile de acelasi fel cantareste 450 grame.Determinati masa cutiei si masa unei bile

Answer 1

5 bile=350 g
7 bile=450 g
7-5=2 bile=450-350=100
2 bile=100 g
1 bila=100:2=50 g  cantareste  o bila
5x50g=250 g bilele
350-250=100 g  cantareste cutia goala
7x50g=350 g. bilele
450-350=100 g. cantareste cutia goala
R: 1 bila = 50 g.
cutia goala=100 g