Brain Teasers Optical Illusions Puzzle Hunts Codes & Ciphers Mechanical Puzzles
Personal Links
Browse Teasers
Search Teasers

Threes and Sevens

Math brain teasers require computations to solve.


Puzzle ID:#1180
Fun:*** (2.54)
Difficulty:*** (2.56)
Submitted By:thephirm**




Using the four digits 3,3,7,7 and the mathematical operators +,-,*,/ write an expression equal to 24. You must use each digit exactly once, but may use each operator multiple times, or not at all. Parentheses are allowed. The following would be a valid expression:

(7 + 3)/(7 + 3) = 1

Open Calculator

What Next?


See another brain teaser just like this one...

Or, just get a random brain teaser

If you become a registered user you can vote on this brain teaser, keep track of
which ones you have seen, and even make your own.



Ichabod Clay
Nov 05, 2001

Just for clarity, you don't need to use fractions since 7 divided by four gives you the same answer as the fraction 7/4. Very good problem!
(user deleted)
Feb 12, 2002

or you could try:
Mar 16, 2002

Very good problem. I'm sorry Elsie, your answer adds up to 25.
May 20, 2002

elsie, that's 25
Oct 08, 2008

This is one of the best teasers I've seen!

Back to Top

Online Now
6 users and 616 guests

Users In Chat
Follow Braingle!
Fold 'N Fly Paper Airplanes
Easy to follow folding instructions and videos.
Copyright © 1999-2017 | FAQ | Widgets | Links | Green | Subscribe | Contact | Privacy | Conditions | Advertise | Braingle Time: 12:28 am
Sign In Create a free account