We are still looking for more answers although Chris has found one answer to the first one (there is definitely another answer.)
Here is 2 number puzzle for you.
You do not have to use every number but you cannot use any number twice.
You can only use + - x and divide and brackets.
(1) 2,8,25,50,75,100 Magic number is 431 (This one is very hard)
(2) 4,6,25,50,75,100 Magic number is 821 (This one is easier but maybe not super easy )
Answers: http://web2.0calc.com/questions/here-is-a-number-puzzle-for-you-nbsp-it-s-a-tough-one