Question

Patru becuri consuma in 3 ore 3 kw . cat inseamna 6 becuri in 20 de ore?

Answer 1

4b.............3h...........3kw
6b..............20h.........x

In primul rand aflam cat consuma 6 becuri in 3 ore.

4b..........3h........3kw
6b..........3h........x

Deoarece la mijloc avem 3h si 3h in ambele randuri nu il consideram, deci;

x=$\frac{6X3}{4}$⇒$x= \frac{18}{4}$

Acum ca stim cat consuma 6 becuri in 3 ore putem afla cat consuma in 2o ore:

6b.........3h..........$\frac{18}{4}$kw
6b.........20h.........x

x=$\frac{20 \frac{18}{4} }{3}$⇒x=30kw