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555-605 Level|   Math Related|            
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sinsve
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Here's what I'm not understanding...

If Francois pays out $750, then he owes $1,500. ($750 is 50% of $1,500).
If Pierre pays out $250, then he owes $2,500. ($250 is 10% of $2,500).

Together, Francois and Pierre pay out a total of $1,000. However, they owe Claudine a total of $4,000 ($1,500 + $2,500). $1,000 is not 40% of $4,000.

Now, if you use $750 for Francois and only $50 for Pierre, the math works out as follows:

Total Payment = 750 + 50 = 800
Total Owed = 1500 + 500 = 2000

And $800 is 40% of $2,000.

Could someone PLEASE shed some light. I've been tinkering over this problem for the past hour. :(
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0.5 F + 0.1 P = 0.4 (F + P)
If F owes 750 then he pays 750*0.5 = 375
if P owes 250 then he pays 250*0.1 = 25
Total = 375 + 25 = 400
Now 40 % of combined= 0.4 * (750 + 250) = 400
Both are same.
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Let X be the total amount Francois owes and Y be the total amount Pierre owes

given 0.5X + 0.1Y = 0.4(X+Y) -> X=3Y

Now comes the tricky part, The ask from the question can be interpreted in 2 ways

1) The Remaining amount they owe after the above payment (i.e 0.5X, 0.9Y)

Ratio of the owed amounts(Francois : Pierre)= 0.5x : 0.9y = 1.5y : 0.9y = 5: 3

None of the combinations in the given choices satisfy the above ratio

OR

2) The actual owed amount before paying the 1st installment (i.e X, Y)

Ratio of the owed amounts(Francois : Pierre)= x : 0.9 = 3y : y = 3: 1

Francois : Pierre = 750 : 250 satisify the above ratio


Personally I feel the ask from the question should have been more precise.

When i solved this question in the practice mock, I went with approach 1. So got it wrong in then
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This can be done under a minute using weighted average method. Thanks to VeritasKarishma.
Setting up weights for P and F,

P (10%) ----------------------- Avg (40%) ----------------------- F(50%)

By this we know that P/F = 10/30 = 1/3. So, you just need to pick answer choices that are consistent with F=3P.
So, choice B for P, and choice C for F.
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SlikRick
Here's what I'm not understanding...

If Francois pays out $750, then he owes $1,500. ($750 is 50% of $1,500).
If Pierre pays out $250, then he owes $2,500. ($250 is 10% of $2,500).

Together, Francois and Pierre pay out a total of $1,000. However, they owe Claudine a total of $4,000 ($1,500 + $2,500). $1,000 is not 40% of $4,000.

Now, if you use $750 for Francois and only $50 for Pierre, the math works out as follows:

Total Payment = 750 + 50 = 800
Total Owed = 1500 + 500 = 2000

And $800 is 40% of $2,000.

Could someone PLEASE shed some light. I've been tinkering over this problem for the past hour. :(

Originally, F owed $750 and P owed $250

F paid back $375 (50%) an P paid back $25 (10%)

Total amount originally owed = $750 + $250 = $1000
Total paid back = $375 + $25 = $400

$400 is 40% of $1000

Hope this helps
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SlikRick
Here's what I'm not understanding...

If Francois pays out $750, then he owes $1,500. ($750 is 50% of $1,500).
If Pierre pays out $250, then he owes $2,500. ($250 is 10% of $2,500).

Together, Francois and Pierre pay out a total of $1,000. However, they owe Claudine a total of $4,000 ($1,500 + $2,500). $1,000 is not 40% of $4,000.

Now, if you use $750 for Francois and only $50 for Pierre, the math works out as follows:

Total Payment = 750 + 50 = 800
Total Owed = 1500 + 500 = 2000

And $800 is 40% of $2,000.

:(


Francois doesn't pay out $750.
Pierre doesn't pay out $250.
Quote:
Select for Francois and Pierre amounts that Francois and Pierre could owe Claudine­
We have to select the figures that represent the total amounts these two owe, not what they have already paid.
 
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sinsve
Francois and Pierre each owe Claudine money. Today, Francois will make a payment equal to 50% of the amount he owes Claudine, and Pierre will make a payment equal to 10% of the amount he owes Claudine. Together, the two payments will be equal to 40% of the combined amount that Francois and Pierre owe Claudine.

Select for Francois and Pierre amounts that Francois and Pierre could owe Claudine that are jointly consistent with the given information. Make only two selections, one in each column.­

ID: 100437
\(\frac{­f}{2} + \frac{p}{10} = \frac{2(f+p)}{5}\)­

After simplifying

\(f=3p\)

\(p=250\) and \(f=750\)­
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