Răspuns :
17g+164=21g/-17g
164=4g/:4
g=41
17g=41*17=697 beculete
21g=41*21=861 beculete
164=4g/:4
g=41
17g=41*17=697 beculete
21g=41*21=861 beculete
17ghirlande+164beculete=21ghirlande-17ghirlande
164=4ghirlande:4
ghirlande =41
17ghirlande=41*17=697 becuri
21ghirlande=41*21=861 becuri
164=4ghirlande:4
ghirlande =41
17ghirlande=41*17=697 becuri
21ghirlande=41*21=861 becuri