Răspunsuri

2014-05-19T18:17:53+03:00
3 robinete..............15 ore
5 ,,.........................x ore
intre valori exista o proportionalitate inversa⇒
x=3.15/5=9 ore
2014-05-19T18:21:50+03:00
Daca 3 robinete pot umple in 15 ore ,atunci
5 robinete pot umple in  "x" ore
 Sunt valori invers proportionale
Rezulta ca :
x= 3 × 15 : 5
x= 45 : 5
x= 9
Deci 5 robinete pot umple aceeasi piscina in 9 ore