1. ## Math homework

So... We got a homework for bonus points so I can't figure out what to do.
Some passangers enter the bus at the beginning. At the first stop 1/9 of those passangers step out. At second stop no one steps out, but the number of passangers is increased by 3/4 of the number of how many came there anyway. At the third stop, 6/7 of passangers who arrived step out and there are 16 passangers left.
How many passangers entered the bus at the beginning?
I know the answer is 72, don't know how to get it.
Tried: z-1/9z+3/4z-6/7z=16 and z-1/9z+3/4x(z-1/9z)-6/7x(3/4x(z-1/9z)=16
Doesn't work out. FFFUUUUU

2. I don't even know from where the z's showed up .

3. My brains hurt.

4. gib 5 mi ill send u a pm

5. You have two variables and two equations, solve for a single variable, plug it into the second equation to solve for the other variable, then take the number value you derived and plug it in to solve for the other variable. In this one, the obvious choice would be to solve for z (you get an equation) then plug that in for z in the second equation. Solve for x ( you get a number) take that value for x and plug it into the second equation then solve for z.

Of course this is all assuming you set up your two equations properly, I didn't bother going over the math.

6. Originally Posted by Ecstasy
gib 5 mi ill send u a pm
Bet you he didn't. XD

Here's two equations.

((z-z/9)*1.75) = x

x - (6x/7) = 16

Solve in reverse order to win.

7. Originally Posted by arunforce

Bet you he didn't. XD

Here's two equations.

((z-z/9)*1.75) = x

x - (6x/7) = 16

Solve in reverse order to win.
I was but im busy. XD

8. Originally Posted by Ecstasy

I was but im busy. XD
You can multitask while smokin dix. /

9. Originally Posted by arunforce

You can multitask while smokin dix. /
what part do you not understand? I dont fucking smoke dix

10. Originally Posted by arunforce

Bet you he didn't. XD

Here's two equations.

((z-z/9)*1.75) = x

x - (6x/7) = 16

Solve in reverse order to win.
Awe come on I wanted to look smart jackass beat me to it :[

11. ## The Following User Says Thank You to Viktor For This Useful Post:

unicorn69 (10-18-2012)

12. no one goes there...

And, use backwords stuff or whatever its called

13. ## The Following User Says Thank You to Bernard. For This Useful Post:

unicorn69 (10-18-2012)

14. You can mention Sperm Bubble Boi

15. whenever i have shit like this i just yahoo answers it the day before it's due and get it

16. Thanks to all of you, did it myself anyway. The equotation was right and everything, I just messed up adding up.