Simple equation solving

• Sep 17th 2011, 05:42 PM
Simple equation solving
Hi,

Im new to this forum, so I hope im i line with posting correctly and everything.
Ive totally forgot how to solve simple equations:(

(100 - S) = 8,042 * S,

How would one solve this?
• Sep 17th 2011, 05:43 PM
mr fantastic
Re: Simple equation solving
Quote:

Hi,

Im new to this forum, so I hope im i line with posting correctly and everything.
Ive totally forgot how to solve simple equations:(

(100 - S) = 8,042 * S,

How would one solve this?

Start by adding S to both sides: 100 = 8043*S ....
• Sep 17th 2011, 05:47 PM
Re: Simple equation solving
Oh, I think I figured it out myself. Unfortunately in my case, math is forgotten over time:(

8,042 * S = S - 100 ((adding S)
9,042S = 100
S = 100/9,024
S = 11.06
• Sep 17th 2011, 07:26 PM
Wilmer
Re: Simple equation solving

Seems like you're trying to play hockey without skates (Wink)

Lets do one similar to yours:
10 - 2a = 803a (2a means 2 * a, 803a means 803 * a)
10 - 2a + 2a = 803a + 2a
10 = 805a ...still with me?
now wrap up:
a = 10/805
a = .01242...

Now go do yours similarly...
• Sep 18th 2011, 12:25 AM
mr fantastic
Re: Simple equation solving
Quote:

Oh, I think I figured it out myself. Unfortunately in my case, math is forgotten over time:(

8,042 * S = S - 100 ((adding S)
9,042S = 100
S = 100/9,024
S = 11.06

Your equation is different to the one in post #1. Why S - 100? In post #1 you wrote 100 - S.

Post #2 tells you what to do ....
• Sep 18th 2011, 03:30 AM
HallsofIvy
Re: Simple equation solving
Quote:

Oh, I think I figured it out myself. Unfortunately in my case, math is forgotten over time:(

8,042 * S = S - 100 ((adding S)

This is not your original problem. Your original problem was 8,042*S= 100- S. For the original problem, adding S is correct and you get

Quote:

9,042S = 100

Quote:

S = 100/9,024
S = 11.06
Oh, wait, you are using the European notation- 8,042 means "8 and 42 thousandths" which I would write as "8.042". In that case you are correct. I notice that mr fantastic made the same assumption. We wouldn't have been fooled if there hadn't been exactly three decimal places!!

The correct answer is either 11,08 (NOT 11,06) if you are using the "," to separate whole number from decimal part or 0.011 if you are using "." with "," separating thousands.
• Sep 18th 2011, 10:14 AM
Re: Simple equation solving
Yea back to schoo. And im not going to say what course im studying, after asking for this problem:)

I did yours, and mine the same way as how Mr-fantastic said. Donno why, just forgot it:(
• Sep 18th 2011, 10:20 AM