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Let x be the number of kids tickets sold and y be the number of adult tickets sold

So we have  

x + y = 432

And the number of each type of ticket sold times its price gives us the total reveue....so we have

20x + 50y = 18240          and using the first equation and subtracting x from both sides, we have.... y  = 432 - x     and subbing this into the 2nd equation for y, we have

20x + 50(432 -x) = 18240   simplify

20x + 21600 - 50x = 18240  

-30x + 21600 = 18240     subtract 21600 from each side

-30x = -3360     divide by -30 on each side

x =112  and that's the number of kids tickets sold

And  y= 432 - x =  432 - 112  = 320   and that's the  number of adult tickets sold

9+10 caculate your self on a cacluator if not ask happy7

Are you multiplying the 4/5?

What do you need help with??....It looks as if you already figured it out....

I like your logic......let's look at it mathematically

(1/20x+5≤6    subtract 5 from both sides

(1/2)x ≤1    multiply both sides by 2

x ≤ 2         and everybody is "happy"

I should have known already,right?

3^-x = 243

This says that

1/3^x = 243   which implies that

3^x = 1/243   but 243 = 3^5   ... so.... 1/243 = 1/3^5  = 3^-5  ...so...

3^x = 3^-5   and it's obvious that x = -5

Well duh!  DUH!

Apperently I make it weirder haha. 

Very good question loleris.  I was wondering that myself

WHAT IS UP WITH PEOPLE TODAY?

Ummmmm....that's a problem......I don't know how I got there.......actually,  I suppose I did

I looked ahead and saw that whatever the solution to x*(1/2) is......it would be added by 5, but would need to be less than six.  So x*(1/2)=<1 for the solution to work

2*(1/2)=1  so it would x=<2

What you expect me to say when you make no sense then say "by by question". Like really come on.

thanks happy

Now it is your spelling happy.

no hi um i gusse or i disiprove you question

Hey Gar  Good t see ya

Uh...h7....can you show the steps to this one???.....just giving the answers doesn't explain how you got there...

Umm...hi. (I guess)

See happy you are a Mr. Know-It-All. 

hi hi hi hi hi h1

To answer the question,  $${\mathtt{54}}{\mathtt{\,\times\,}}{\mathtt{12}} = {\mathtt{648}}$$

$648

I noticed it changed when he said "by by question". IDK why but whatever.

plz help quick