24-8=16 zile ramase
12 muncitori........................16 zile
16 muncitori.........................x zile
..............................................................
12 muncitori·16 zile=16 muncitori·x zile; (sunt invers proportionale)
x=12·16/16
x=12 (zile)
in total: 8 zile + 12 zile=20 zile