similar to the 4x4 puzzle

express the number 24 by the following four numbers using only * / + -

a) 10, 10, 4, 4 (easy)
b) 7, 7, 3, 3 (medium)
c) 8, 8, 3, 3 (not so easy)

anyone has similar puzzles to this?

edit: oh and every number has to be used seperatly...cant use "38" or so in c).

Originally posted by crazyblue
express the number 24 by the following four numbers using only * / + -

a) 10, 10, 4, 4 (easy)
b) 7, 7, 3, 3 (medium)
c) 8, 8, 3, 3 (not so easy)

anyone has similar puzzles to this?

edit: oh and every number has to be used seperatly...cant use "38" or so in c).

a - 10+10+4+4
b - 7x3 +3
c - 8x3

Try 7, 7, 7, 7, 7, 7 to make 777

Originally posted by doodinthemood
a - 10+10+4+4
b - 7x3 +3
c - 8x3

Try 7, 7, 7, 7, 7, 7 to make 777

erm, i didnt mention (because i thought its clear) that of course you have to use ALL numbers. 🙂
in b) one 7 is misssing, in c) 8 and 3 are missing.

and about a)....add the numbers again. is it really 24? 😉

a) [(10 x 10) - 4] / 4

Oooh you really caught me out. I'm pretty drowsy this morning. Still, try the 6 sevens one 🙂

b) [(3/7) + 3] x 7

well done. but it seems, nobody can solve c)

oh and about the 7's. is it 777 + (7-7)*7. that would be a bit too easy i guess?!

no using 77 or 777

(7*7+7)*(7+7)-7 🙂

my god you're good.

Originally posted by crazyblue
(7*7+7)*(7+7)-7 🙂

392.
Myself and Excel says so, at least, so...

Originally posted by DeepRed
392.
Myself and Excel says so, at least, so...

(7*7+7)*(7+7)-7...

= (49+7)*(14)-7
= (56)*(14)-7
= 784-7
= 777

Originally posted by crazyblue
(7*7+7)*(7+7)-7...

= (49+7)*(14)-7
= (56)*(14)-7
= 784-7
= 777

Two ways of interpreting it.
I thought you meant that 56 * (14-7) was 777.
Sorry.

To answer the original question, C) is 8/(3-8/3)

Originally posted by Alaskan
To answer the original question, C) is 8/(3-8/3)

You get my applause for that one.