Question

prin trei robinete curg in 4 ore 10 800 litri de apa. cati litri de apa curg prin cinci robinete(de aceladi tip cu primele) in 3 ore

Answer 1

3r..............4h...............10 800l
3r..............1h...............x

x=1* 10 800/4=  2700l

3r............1h...........2700l
3r.............3h.............y

y=3*2700/1=  8100l

3r............3h............8100l
5r.............3h..............z

z=5*8100/3
z=5*2700
z=13500l