Welcome to Carsten's Test - Can You Solve the Equation?

In summary, The conversation is about finding valid equations using numbers 1 to 9 and inserting + signs and one = sign to make a sum of 90. There are multiple solutions, such as 1+2+3+4+56+7+8=90 and 12+3+45+6+7+8+9=90. The conversation also briefly touches on the concept of perfect numbers, which are equal to the sum of their factors.
  • #1
arcnets
508
0
Hi, I'm the guy formerly known as carsten. This is just a test to see if everything works.
OK, you have the numbers
1 2 3 4 5 6 7 8 9 0.
You may insert some + signs and one = sign so to make a valid equation.
Like
12+34+5+6+78=90 (oops, false! )

Happy posting, and a big thanks to Greg who does a great job IMO.
 
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  • #2
Easy ..
1+2+3+4+5+67+8=90 :smile:
 
  • #3
Yes. There's more solutions. :wink:
 
  • #4
1 + 2 + 3 + 4 + 56 + 7 + 8 + 9 = 90
12 + 3 + 45 + 6 + 7 + 8 + 9 = 90
 
  • #5
You used the 9's twice drag.

12+3+4+56+7+8=90
1+23+45+6+7+8=90
nothing =890
nothing=7890
etc.

Njorl
 
  • #6
If 2n-1 is prime, what can you say about (2n-1)*(2n-1)?

Njorl
 
  • #7
Perfect!
 
  • #8
Absolutely. I thought that would take longer.

Njorl
 
  • #9
Originally posted by Ben-CS
Perfect!
What do you mean perfect?
 
  • #10
A perfect number is equal to the sum of its factors. For this purpose, 1 is considered a factor, but the number itself is not.

Factors of 6 are 1,2,3 1+2+3=6
Factors of 28 are 1,2,4,7,14 1+2+4+7+14=28

6 and 28 are perfect.

Njorl
 

1. What is "Welcome to Carsten's Test - Can You Solve the Equation?"

"Welcome to Carsten's Test - Can You Solve the Equation?" is a math puzzle game created by Carsten, where players are presented with an equation and must solve it using the given numbers and operations.

2. How do I play the game?

To play the game, simply read the equation and use the given numbers and operations to solve it. You can use a calculator or solve it mentally. Once you have your answer, click the "Check Answer" button to see if you are correct.

3. Are there different levels of difficulty?

Yes, there are different levels of difficulty in the game. The equations get progressively more challenging as you advance to higher levels. However, the basic rules and operations remain the same.

4. Is there a time limit for solving the equations?

No, there is no time limit for solving the equations. You can take as much time as you need to solve each equation. However, for a more challenging experience, you can try to solve the equations within a set time frame.

5. Can I play this game with friends?

Yes, you can play this game with friends by sharing the link to the game or playing together in person. You can compete against each other to see who can solve the equations faster or work together to solve them as a team.

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