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Printr-un robinet curg in 5 minute 120 litri de apa . in cat timp poate fi umplut un bazin cu capacitatea de 840 ? va rog ajutatima

Răspuns :

regula de 3 simple
Daca 120 L apa................................curg in 5 min
Atunci in 840 L apa.............................x min
Si avem x
x= 840x5 /120
x=4200/120
x= 35 min

5min...... 120l
x...............840l
___________
5min/x=120l/840l
==>5min*840=x*120l
120x=4200l |:120
X=35 min
(* steluta inseamna ori)