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the mother is 61, the daughter is 34

yep! we all knew the truth about that city :P

What has keys but no locks, space but no room, and you can enter, but you cannot go in?

Edit: Lol i forgot a word XD

Here is one that will give you a headache:

 A mother says to her daughter, "When I was your age, you were only 7. But when you become my age, I will be 88 years old. What is the present age of the mother and that of the daughter?

Chicago

yes!

What is 3/7 chicken, 2/3 cat and 2/4 goat?

You are thunder and your brother is lightning. You can see lightning and hear thunder, and thunder always follows lightning.

KM is a median....so KO = 2MO

So  KO  = 2 (23)  =  46 in

Here is a riddle of mine:

I always follow my brother, although very different we are. You can see him, but not me. You can hear me, but not him. What are we?

Haha good job! Answered all of them correctly!!

SIX - 9(IX)=S

9(IX)-10(X)=I

40(XL)-50(L)=X

S+I+X=6

that stumped me for a sec but i was doing latin homework XD

This is one of the hardest ones I've got.

Take 9 from 6, 10 from 9, 50 from 40 and leave 6.
How?

x^3-x^2+x+1 =x^3+x^2+x-1 

Subtract x^3, x   from each side

-x^2 + x + 1  =  x^2 - 1

-x^2 + 1  = x^2 - 1    rearange as

0  =  2x^2 - 2

2x^2 - 2  = 0     divide through by 2

x^2 - 1  = 0    factor

y = (1)^3 + (1)^2 + 1 - 1  =

(x + 1) ( x - 1)  = 0 

Set each factor to 0 and solve for x

And  x = 1   or x = -1

And using  x^3+x^2+x-1   

y = (1)^3 + (1)^2 + 1 - 1  =  2

y = (-1)^3 + (-1)^2 - 1 - 1  =  -2

So the solutions are  (1, 2)  and (-1. -2)

he takes a piece of wood, sets fire to the eastern forest and camps among an area with no area for the fire to burn.

Alexander is stranded on an island covered in forest.
One day, when the wind is blowing from the west, lightning strikes the west end of the island and sets fire to the forest. The fire is very violent, burning everything in its path, and without intervention the fire will burn the whole island, k i l l i n g the man in the process.
There are cliffs around the island, so he cannot jump off.
How can the Alexander survive the fire? (There are no buckets or any other means to put out the fire)

9/9+99

How about this one?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

if you want to know how i answered so fast, ive heard it a million times from my friends, so i know it really well.

you are 72 years old. I don't feel like details cause who needs them for puzzles, but you are 72 years old.

0.00000414=4.14  x 10^-6

I think it could be 11.5

Thanks so much!

f^-1 (4)  =  3

h(7)  =  5

So

h (h (7) )  =  h (5)  =   - 1

(x^2 + 2x - 1)(x^2 + 2x + 5) =

x^2 * x^2    + x^2 *2x +  5x^2   =  x^4 + 2x^3 + 5x^2    (1)

2x*x^2 + 2x*2x + 10x  =  2x^3 + 4x^2 + 10x   (2)

-1*x^2 - 1*2x - 1*5  =   -x^2 - 2x - 5   (3)

Combining (1) (2) (3)  we have

x^4 + 4x^3  + 8x^2 + 8x - 5