7. If 12 men or 15 women can finish a piece of work in 66 days, how long will 24 men and 3 women take to finish the work?
Ответ:
12men <--> 66days
--> 1men <--> 66*12=792days
--> 24men <--> 792/24 = 66/2 = 33 days
15women <--> 66days
--> 1women <--> 66*15=990days
--> 3women <--> 990/3 = 66*5 = 330 days