Here are 2 number puzzles for you.

and for the hard one I got

(50*75-(100+2))/8-25=431

solution:

(1)     https://www.youtube.com/watch?v=nG4QCob_dNw&feature=em-subs_digest-vrecs

(2)     https://www.youtube.com/watch?v=n8-mx3RSvOQ

          OR Melody's way    6(100+50)-75-4 = 821

(1)       2,8,25,50,75,100  Magic number is 431

Couldn't solve...

(2)       4,6,25,50,75,100   Magic number is 821

Couldn't solve...

Hi Ninja,

Somehow I think your first solution needs some brackets?  No it still won't work.  Plus you need to swap the 4 for 8/2    

Why don't you try the easier one?  The hard one is REALLY difficult.

Yeah I messed up a little, I think I copied the wrong set of numbers for the wrong problem or something.

I guess these were harder than they looked!

I just edited my posts a little. Sorry to messy up your thread. 

---------------------------------------------------------

(1)       2,8,25,50,75,100  Magic number is 431

---------------------------------------------------------

$$\left[\frac{75 + 25}{50}+2 \right]*\left[100+8 \right]\Rightarrow$$  For this one, 431/108 is 3.99 but can it be rounded to 4?

$$\left[\frac{100+8}{\frac{75}{2}-25}\right]*50\rightarrow$$  For this one, rats...result is 8.64 after dividing the first part; too bad it can't be 8.62! Does it have to be the exact number or can it be rounded to 8.6...if so, then 431.5!

In the kingdom of Camelot we strive for perfection.  I am using a small magical pigeon so I have not given your answer the  consideration it deserves. However, an exact answer be possible in this magical Kingdom :)

Lady Guinevere

Queen of Camelot.

(1)       2,8,25,50,75,100  Magic number is 431

$$\boxed{\dfrac{\left(50-{\dfrac{100}{25}}\right)*75-2}{8} = 431}$$

$$\boxed{\dfrac{50*75-2-100}{8}-25 = 431}$$

$$\boxed{\left( 100 + \dfrac{75}{50} \right)*\left( \dfrac{8}{2}\right) = 431}$$

(2)       4,6,25,50,75,100   Magic number is 821

$$\dfrac{(6+4*50)*100-75}{25} = 821$$

$$\left( 50+6 \right) \left( \dfrac{4*100}{25}\right)-75 = 821$$

$$\left( 50-6 \right) \left( \dfrac{25*75}{100}\right)-4 = 821$$

$$\left( \dfrac{25*75}{50}+100\right)*6-4 = 821$$

$$\dfrac{( 75-25)*100-50 }{6}-4 = 821$$

$$\dfrac{( 50*100+25-75}{6}-4 = 821$$

$$50-4+25*(6-75+100) = 821$$

$$75-4+6*(100+50-25) = 821$$

$$100-4-25+6*(50+75) = 821$$

They are fabulous answers Heureka.

I think I got a different one again for the 821 magic number one. 

Anyway here are the solutions that I had.  They have been hiding all this time on an invisable post :)

These videos were  from an Australian show called "Letters and Numbers"

Lily Serna is awesome.     another solution to 821 is  also really 'out there'   

http://web2.0calc.com/questions/here-is-a-number-puzzle-for-you-nbsp-it-s-a-tough-one#r1

Hi Melody,

6(100+50) - 75 - 4 = 821

But what about Number 25  (4,6,25,50,75,100) ?

(100+25)*6 + 75 - 4 = 821

But what about Number 50  (4,6,25,50,75,100)  ?

Hi Heureka,

Here are the rules listed at the top of the post

You do not have to use every number but you cannot use any number twice.

So you found all those wonderful solutions and you were making the question harder than it even needed to be.  

Hi Melody,

thank you for the rules.

(1)       2,8,25,50,75,100  Magic number is 431

five Numbers: 

$$\left( \dfrac{75}{100}+50 \right)*8+25=431$$

(2)       4,6,25,50,75,100   Magic number is 821

five Numbers: 

6*(100+50) - 75 - 4 = 821  ( your solution )

6*(100+25) + 75 - 4 = 821 ( your solution )

Your answers were all correct as well  (I think).

You are getting me a little confused Heureka.  Don't worry about it though.  I spend my whole life in a state of confusion. lol.

here is what I came up with for the easy one :)

6(100+50) - 75 - 4 = 821

Great answers Answer Guy!