My Math Forum equation formula

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 November 1st, 2019, 05:46 AM #1 Newbie   Joined: Nov 2019 From: Finland Posts: 9 Thanks: 0 equation formula Hi. You guys know how to calculate (formula) these ones? I'm studying by myself, so I don't get any teacher help. (k-3) – (5-3k) = 2(k+1) should it continue like this... (answer is k = 5) k - 3 - 5 - 3k = 2k + 2 and how about this second one? (answer x = 6) x/2 – (x-1)/5 = 2 Last edited by skipjack; November 1st, 2019 at 06:55 AM.
November 1st, 2019, 06:48 AM   #2
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Quote:
 Originally Posted by Nollataulu Hi. You guys know how to calculate (formula) these ones? I'm studying by myself, so I don't get any teacher help. (k-3) – (5-3k) = 2(k+1) should it continue like this... (answer is k = 5) k - 3 - 5 - 3k = 2k + 2 and how about this second one? (answer x = 6) x/2 – (x-1)/5 = 2
For the first one, note the plus sign in front of the 3k
k - 3 - 5 + 3k = 2k + 2

For the second, what's the common denominator?

-Dan

Last edited by skipjack; November 1st, 2019 at 06:56 AM.

November 6th, 2019, 01:43 AM   #3
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Quote:
 Originally Posted by topsquark For the first one, note the plus sign in front of the 3k k - 3 - 5 + 3k = 2k + 2 For the second, what's the common denominator? -Dan
Thanks a lot!

Second one it's number 10 I guess?

"The price of the computer rose by 8% in the spring but fell by 8% in the autumn, after that omputer cost € 794.88. What was the price of the computer at the beginning of that year?"

Without having that fell by 8% section formula would be:

x + 0,08x = 794,88
1,08 =794,88
x = 736

But when having first going up and then down 8% not sure what kind of formula I should have?

November 6th, 2019, 03:26 AM   #4
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Quote:
 Originally Posted by Nollataulu Thanks a lot! Second one it's number 10 I guess? How about when reading text and then create your own formula base on that text. "The price of the computer rose by 8% in the spring but fell by 8% in the autumn, after that omputer cost € 794.88. What was the price of the computer at the beginning of that year?" Without having that fell by 8% section formula would be: x + 0,08x = 794,88 1,08 =794,88 x = 736 But when having first going up and then down 8% not sure what kind of formula I should have?
Yes, 10 is the common denominator, so multiply every term by 10 to clear the fractions ...

$5x-2(x-1)=20$

take it from here?

percentage problem ...

$0.92(1.08x)=794.88$

November 6th, 2019, 04:17 AM   #5
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Quote:
 Originally Posted by skeeter Yes, 10 is the common denominator, so multiply every term by 10 to clear the fractions ... $5x-2(x-1)=20$ take it from here? percentage problem ... $0.92(1.08x)=794.88$
Thanks a lot about that second one And I guess first one should go like this.

5x-2 (x-1) = 20
5x-2x=20-2
3x=18
x=6

 November 6th, 2019, 04:52 AM #6 Newbie   Joined: Nov 2019 From: Finland Posts: 9 Thanks: 0 How about this one? Jack buys MathForum shares for 2000 euros. How many shares will Jack receive if MathForum's share price is €6,50 and the acquisition cost is €8 plus 0,18% of the value of the shares to be purchased? 6,50x - 8 - 0,0018x = 2000 (?) I'm not sure how I should deal with that 0,18%. Last edited by skipjack; November 7th, 2019 at 03:10 AM.
 November 6th, 2019, 06:17 AM #7 Senior Member   Joined: Jun 2019 From: USA Posts: 376 Thanks: 202 Not quite, rather it's Cost of shares : 6,50x + Acquisition cost : 8,00 + (0,0018*6,50x) = Money spent : 2000,00 $1,0018 \cdot 6,50 ~€ \cdot x + 8,00 ~€ = 2000,00 ~€$ Thanks from topsquark and Nollataulu
November 7th, 2019, 12:51 AM   #8
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 Originally Posted by DarnItJimImAnEngineer Not quite, rather it's Cost of shares : 6,50x + Acquisition cost : 8,00 + (0,0018*6,50x) = Money spent : 2000,00 $1,0018 \cdot 6,50 ~€ \cdot x + 8,00 ~€ = 2000,00 ~€$
Thanks a lot

November 7th, 2019, 03:24 AM   #9
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Quote:
 Originally Posted by Nollataulu Jack buys . . .
Did you invent this problem or change any of the original problem's values?

November 7th, 2019, 04:53 AM   #10
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Quote:
 Originally Posted by skipjack Did you invent this problem or change any of the original problem's values?
Translating and then replacing words Viivi and Outokumpu But problem values just same.

"Viivi ostaa Outokummon osakkeita 2000 eurolla. Kuinka monta osakketta Viivi saa, jos Outokummon osakkeen kurssi on 6,50 euroa ja ostosta aiheutuu kuluja 8 euroa sekä 0,18% ostettavien osakkeiden arvosta?"

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