How much money does Lucy have?

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Discussion Overview

The discussion revolves around a mathematical problem involving the amounts of money Lucy and Mel have, specifically how much money Lucy has after receiving an additional amount. Participants explore the relationships between their initial amounts and how they change after a monetary gift.

Discussion Character

  • Mathematical reasoning
  • Homework-related
  • Exploratory

Main Points Raised

  • Some participants define \(L\) as the amount of money Lucy had initially and \(M\) as the amount Mel had initially, establishing the relationship \(L = \frac{1}{2}M\).
  • Participants express the condition that after receiving \$20, the relationship becomes \(L + 20 = \frac{3}{5}(M + 20)\).
  • One participant attempts to manipulate the equations to find a solution but indicates they are stuck at a certain point in the calculations.
  • Another participant notes that the answer sheet states Lucy has \$60, but they express difficulty in reaching that conclusion.
  • One participant acknowledges being "beaten to it" in providing a similar approach to the problem.

Areas of Agreement / Disagreement

There is no clear consensus on the solution, as participants express differing levels of understanding and progress in solving the problem. Some participants have similar approaches, while others struggle to reach the stated answer.

Contextual Notes

Participants have not resolved the mathematical steps necessary to confirm the final amounts, and there are indications of missing assumptions or dependencies on the definitions of the variables involved.

Yazan975
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- - - Updated - - -

What I did is:

L/2 +20 = 3/5M

L/2+20=6/5L+20

5L+200=12L+200(after putting all of them to common denominator)

I got stuck here
 

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Yazan975 said:
- - - Updated - - -

What I did is:

L/2 +20 = 3/5M

L/2+20=6/5L+20

5L+200=12L+200(after putting all of them to common denominator)

I got stuck here

I would let \(L\) be the amount of money Lucy had initially and \(M\) be the amount of money Mel had initially. From the information given about their initial amounts, we may state:

$$L=\frac{1}{2}M\implies M=2L$$

$$L+20=\frac{3}{5}(M+20)$$

Substitute for \(M\):

$$L+20=\frac{3}{5}(2L+20)$$

Can you proceed?
 
Hi Yazan975! ;)

Originally we had L = M/2.
Then Grandma gave each an additional \$20, after which it became 3/5th.
So (L + 20) = (M + 20) x 3/5.

Since the question asks for what Lucy has now, we need to find (L + 20).

EDIT: beaten to it by Mark.
 
MarkFL said:
I would let \(L\) be the amount of money Lucy had initially and \(M\) be the amount of money Mel had initially. From the information given about their initial amounts, we may state:

$$L=\frac{1}{2}M\implies M=2L$$

$$L+20=\frac{3}{5}(M+20)$$

Substitute for \(M\):

$$L+20=\frac{3}{5}(2L+20)$$

Can you proceed?

The answer sheet I have says Lucy has $60
I can't get there.
Please help

- - - Updated - - -

Yazan975 said:
The answer sheet I have says Lucy has $60
I can't get there.
Please help

Nvm, thanks I got it
 

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