perplexus.info :: Numbers : No Addition Allowed

No Addition Allowed (Posted on 2009-12-14)

Without using addition, make five 6s to equal 30.
Without using addition, make six 7s to equal 42.

The calculations should be exact (no rounding functions). Any common symbols or operators other than addition are allowed.

Replacing addition with subtracting a negative is NOT a solution.

Submitted by Brian Smith

Rating: 3.5000 (2 votes)

Solution: (Hide)

(6*.6-.6)*(6/.6)=30
77-.7-7*7*.7=42

Read the comments for more answers.

Comments: ( You must be logged in to post comments.)

Subject	Author	Date
Puzzle Thoughts	K Sengupta	2024-05-19 00:43:14
re: triangular numbers	Brian Smith	2009-12-15 14:38:10
triangular numbers	Ady TZIDON	2009-12-15 05:56:22
Additional Solutions	Justin	2009-12-14 20:06:50
Solutions	Dej Mar	2009-12-14 17:22:21
solution	Charlie	2009-12-14 14:55:52
POSSIBLE SOLUTIONS	Ady TZIDON	2009-12-14 13:44:57

Please log in:

Login:
Password:
Remember me:

Sign up! \| Forgot password

Search:

Search body:

Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (5)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:


perplexus dot info