In a factory, 60 workers take 9 hours to make 450 bags. How long will 40 workers take to make 750 bags if all of them work at the same rate?

Question

raden · Answer

first, 60 w ----> 450 B ----> 9 h .... (1)
60 w ----> 750 B ----> x h        .... (2)
eq (1) and (2), these is proportional direct
so, 450/750 = 9/x
x=15
next, 40w ---> 750B ----> y h .... (3)
eq (2) and (3), these proportional invers
so, 60/40 = y/15
solve for y, i got y=22.5 hours

anonymous · Answer

Quite confusing though. But thanks alot ! :D So is this a "triple" inverse proportion type of question ? o.o

raden · Answer

yeaaaaaaaaaaaaaa, this is a invers proportion but including direct proportion thought. sorry, if my explained not to well. because i make my anwer in just symbols, (sorry, my grammar to bad, because im from indonesia) :D
btw, 60w=60workers, 450B=450bags, 9h=9hours, but i sure u know what i mean, oke ?