Răspuns :
20m........15 z
15m.........x
-----------------
x=20·15:15=20 zile
20m......15z
x...........10z
-------------------
x=20·15:10=30 muncitori
15m.........x
-----------------
x=20·15:15=20 zile
20m......15z
x...........10z
-------------------
x=20·15:10=30 muncitori
20 muncitori .........15 zile
15 '' ......................x
--------------------------------------
20/15 =x/15
x =20*15/15 = 20 zile
20 M .........15 z
x .............10 z
-------------------------------
x/20 =15/10
x =20*15/10 =30 muncitori
15 '' ......................x
--------------------------------------
20/15 =x/15
x =20*15/15 = 20 zile
20 M .........15 z
x .............10 z
-------------------------------
x/20 =15/10
x =20*15/10 =30 muncitori