# Help with Brain Teaser

Registered User, __BANNED USERS regular
Our Math teacher gave us this problem in class just for fun.

You have five cards with individual numbers on each: 6, 2, 7, 4, and and equal sign (=). You can shuffle the cards around anyway you want, but you have to somehow make a true statement out of only these cards. I'm of the opinion that it's a trick question, but what do you guys think? Hmmm... could it be that we can actually use the cards more than once, and he simply means we couldn't add a card with a different number or symbol on it? Sigh... I dunno, it's driving me crazy.

## Posts

• Inside a cluster b personalityRegistered User regular
edited October 2012
Well 6/2 = 7-4

But I have the feeling that its something stupid like flipping the number cards over and two cards equals two cards.

Metalbourne on
• Registered User, __BANNED USERS regular
Yeah, the only thing I'm allowed to use is the numbers and the equal sign, no other symbols like a plus or minus symbol or anything.

• Registered User regular
how is the 4 written on the card? if it's like the font here on the forum you could do this by covering part of the 4 and flipping the 6: (excuse the shit quick paint drawing)

Steam Profile: FoomyFooms
• Registered User, __BANNED USERS regular
Now that's interesting... That might actually be it.

• Registered User regular
edited October 2012
There's a difference between "out of only these cards" and "out of all these cards".

I'd just go with "2+4 = 6" and call it done.

[Edit: I'm assuming you can use some basic operators between them, at least, or this is flat impossible, since you weren't given two of the same number. Hard to solve without the exact text of the question.]

CycloneRanger on
• San DiegoRegistered User regular
An alternative might be 7^2 = 49, if you flip the 6 over to make a 9, and position the 2 up and to the right of the 7 to indicate "7 to the 2nd power".

• Registered User regular
How is the 7 written? Could you make it a less than sign? So for example 6 (turned 7) = 2 4 becomes 6 <= 24

Steam/LoL: plushycthulhu
• Registered User, __BANNED USERS regular
I dunno... i give up though. lol. I'm just going to ask him next week what the solution was.

• Registered User regular
edited November 2012
it's the 7^2=49. It was a recent puzzler on npr's CarTalk, and that's the answer they gave.

Powerpuppies on
• resting shark face Registered User regular
edited November 2012
42 = 6*7 for no flipping shenanigans

EDIT: Nevermind you probably can't use the * operator?

Sir Landshark on
Please consider the environment before printing this post.
• Registered User, __BANNED USERS regular
Thanks guys! I'll try that answer Powerpuppies.

• San DiegoRegistered User regular
it's the 7^2=49. It was a recent puzzler on npr's CarTalk, and that's the answer they gave.
Man, it seems like radio or other audio-only media would make it really hard to solve, having to flip the cards around and whatnot while not forgetting the actual numbers.