Răspuns :
Folosim regula de 3 simpla
20kg............10 borcane
x kg..............1 borcan
x=20/10=2 kg
20 kg caise-----------------------------------10 borcane dulceata
x? kg caise---------------------------------------1 borcan dulceata
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x = (20*1) / 10
x = 20 / 10
x = 2 kg caise
x? kg caise---------------------------------------1 borcan dulceata
______________________________________________________
x = (20*1) / 10
x = 20 / 10
x = 2 kg caise