Question

12 muncitori termina o lucrare in 15 zile .  
In cate zile vor termina aceeasi lucrare 18 muncitori 

Answer 1

12m .............. 15z
18m.................X z

$\frac{12x15}{18}$ = 2 · 5 = 10 zile

Answer 2

12 muncitori ................... 15 zile 
18 muncitori ................... x 


$\frac{x}{15} = \frac{12}{18} =>x= \frac{15*12}{18} =>x= \frac{180}{18} =>x=10 \ \ zile$