Question

O cutie care contine 15 bomboane cantareste 180 grame.Cutia goala cantareste cat 5 bomboane.Cât cântaresc numai bomboanele?

Answer 1

stim urmatoarele :

15 bomboane + cutia = 180 grame

cutia = 5 bomboane

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15 bomboane + 5 bomboane = 180 grame

20 bomboane = 180 g

1 bomboana = 180 g : 20 = 9 grame

15 bomboane = 15 x 9 = 135 grame

Answer 2

c+15b=180, c=180-15b

c=5b, egalam valorile lui c 180-15b=5b, 20b=180, b=180/20=9 grame cantareste o bomboana

15*9=135 grame cantaresc numai bomboanele