Question

DAU COROANA!!URGENTTT VA ROG!

Answer 1

Primul robinet = 20l /min => 20•30 l in 30 min= 600 l in 30 min
Al doilea= 4/5 • 20= 16l/min => 16l • 30 in 30 min= 480 l in 30 min
Al treilea= 3/4 • 16l/min= 12 l/min => 12l • 30 in 30 min = 360 l
Capacitate= 2kl= 2000l
L apa necesari= capacitate - (primul robinet+al doilea+ al treilea) =
2000l - (600+480+360)= 2000 l - 1440 l = 560 l

Answer 2

Primul robinet:20 l
Al doilea robinet:4/5×20=16 l
Al treilea robinet:3/4×16=12 l
Total litri pe minut:20+16+12=48 l
Total litri 30 minute:48×30=1440 l
Capacitate bazin:2 kl=2000 l
Litri necesari umplere bazin:2000-1440=560 l