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To celebrate a colleague's retirement, the T coworkers

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To celebrate a colleague's retirement, the T coworkers in an office [#permalink] New post 07 Mar 2010, 23:42
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A
B
C
D
E

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  35% (medium)

Question Stats:

65% (02:09) correct 35% (01:23) wrong based on 105 sessions
To celebrate a colleague's retirement, the T coworkers in an office agreed to share equally the cost of a catered lunch. If the lunch costs a total of x dollars and S of the coworkers fail to pay their share, which of the following represents the additional amount, in dollars, that each of the remaining coworkers would have to contribute so that the cost of the lunch is completely paid?

A. x/T
B. x/(T-S)
C. Sx/(T-S)
D. Sx/T(T-S)
E. X(T-S)/T
[Reveal] Spoiler: OA
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Re: To celebrate a colleague's retirement, the T coworkers in an office [#permalink] New post 07 Mar 2010, 23:52
vakuts wrote:
Hi everyone,

I am struggling with this problem from GMATPrep test:

To celebrate a colleauge's retirement, T coworkers in an office agreed to share equally the cost of catered lunch.
If lunch costs X dollars and S of coworkers fail to pay their share, which of the following represents the additional amount, in dollars, that each of the remaining coworkers would have to contribute so that the cost of lunch is completely paid?

a) X/T
b) X/(T-S)
c) SX/(T-S)
d) SX/T(T-S)
e) X(T-S)/T

Thanks!

[Reveal] Spoiler:
D


Since no absolute values are given in the question we can replace the given parameters with assumed numbers,

Let Total colleagues be 100 (T)
Let total contribution be 500 (X) (point to note is that its total cost not per person)
Those who dont pay are S (30)

Per person cost = X/T = 500/100 = 5

So cost for those who failed to pay = (X/T) * S = SX/T = 30*5=150

The equation for people who would bear the total cost after S people fail = (T-S)=70

There fore the solution is (SX/T)/ (T-S) = SX/T(T-S) = 150/70

Answer D

Hope this helps !!!
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Last edited by mustdoit on 08 Mar 2010, 00:06, edited 2 times in total.
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Re: To celebrate a colleague's retirement, the T coworkers in an office [#permalink] New post 08 Mar 2010, 00:00
to save time you can pick number :

T=6 , x= 12 and s= 2

if we say that 2 worker will not pay , that mean we will divide their required payment on others(4 worker out of 6).

that mean each of the 4 remaining workers should pay 1 .

so by subistitution we will find that D is the only that will give us 1 answer.
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Re: To celebrate a colleague's retirement, the T coworkers in an office [#permalink] New post 12 Mar 2010, 08:31
vakuts wrote:
Hi everyone,

I am struggling with this problem from GMATPrep test:

To celebrate a colleauge's retirement, T coworkers in an office agreed to share equally the cost of catered lunch.
If lunch costs X dollars and S of coworkers fail to pay their share, which of the following represents the additional amount, in dollars, that each of the remaining coworkers would have to contribute so that the cost of lunch is completely paid?

a) X/T
b) X/(T-S)
c) SX/(T-S)
d) SX/T(T-S)
e) X(T-S)/T

Thanks!

[Reveal] Spoiler:
D


New amount paid by T-S = X/(T-S)
Extra amount by everybody = X(1/(T-S) - 1/T)
= SX/T(T-S) hence D.
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Re: To celebrate a colleague's retirement, the T coworkers in an office [#permalink] New post 12 Mar 2010, 22:14
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T - total number of people
S- number of people that left
X - total amount $

\frac{X}{T} - $ that 1 person had to pay at first.
\frac{X}{T}*S - $ that should be shared
T-S - people who should share \frac{X}{T}*S

\frac{\frac{X}{T}*S}{T-S} - aditional payment for 1 person

simplify: \frac{\frac{X}{T}*S}{T-S}=\frac{XS}{T}*\frac{1}{(T-S)}
:wink:
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Re: To celebrate a colleague's retirement, the T coworkers in an office [#permalink] New post 15 Mar 2010, 07:35
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Answer is D XS/T(T-S)
Originally everyone has to pay = X/T
when s people failed to pay each remaining person has to pay = X/(T-S)
so additional amt = X/(T-S) - X/T = XS/T(T-S)
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Re: To celebrate a colleague's retirement, the T coworkers in an office [#permalink] New post 23 Jun 2010, 09:01
sidhu-

would you mind explaining how you simplify X/(T-S) - X/T = XS/T(T-S) ?

I got to the X/(T-S) - X/T but I cannot figure out how to get to the answer choice D.

Appreciate it!

-Sameer
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Re: To celebrate a colleague's retirement, the T coworkers in an office [#permalink] New post 23 Jun 2010, 10:46
sameermunshi wrote:
sidhu-

would you mind explaining how you simplify X/(T-S) - X/T = XS/T(T-S) ?

I got to the X/(T-S) - X/T but I cannot figure out how to get to the answer choice D.

Appreciate it!

-Sameer


Sameer,

It's pretty simple.
We have => Additional amount to be paid by each = \frac{X}{(T-S)} - \frac{X}{T}

=> Take LCM => Denominator becomes T(T-S) and Numerator becomes XT - X(T-S)

=> So we have \frac{XT - X(T-S)}{T(T-S)}

=> \frac{XT -XT + XS}{T(T-S)}

=> XT gets cancelled in numerator => \frac{XS}{T(T-S)} => choice D.
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To celebrate a colleague's retirement, the T coworkers [#permalink] New post 07 Dec 2012, 19:33
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To celebrate a colleague's retirement, the T coworkers in an office agreed to share equally the cost of a catered lunch. If the lunch costs a total of x dollars and S of the coworkers fail to pay their share, which of the following represents the additional amount, in dollars, that each of the remaining coworkers would have to contribute so that the cost of the lunch is completely paid?

A. x/T
B. x/(T-S)
C. Sx/(T-S)
D. Sx/T(T-S)
E. X(T-S)/T
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Re: To celebrate a colleague's retirement, the T coworkers [#permalink] New post 07 Dec 2012, 19:45
Cost of lunch = x
Number of People = T

If all joined in to pay, each will pay \frac{x}{T}
But that did not happen, only T-S paid. Thus, each who paid contributed \frac{x}{T-S}

\frac{x}{T-S}-\frac{x}{T} --> extra amount they paid because S are stingy..
\frac{xT - xT + xS}{(T)(T-S)}
\frac{xS}{T(T-S)}

AnsweR: D
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Re: To celebrate a colleague's retirement, the T coworkers [#permalink] New post 07 Dec 2012, 19:51
Expert's post
apoorvarora wrote:
To celebrate a colleague's retirement, the T coworkers in an office agreed to share equally the cost of a catered lunch. If the lunch costs a total of x dollars and S of the coworkers fail to pay their share, which of the following represents the additional amount, in dollars, that each of the remaining coworkers would have to contribute so that the cost of the lunch is completely paid?

A. x/T
B. x/T-S
C. Sx/T-S
D. Sx/T(T-S)
E. X(T-S)/T


Initial BURDEN on each coworker--->Total cost/ Number of Coworkers

or X/T

Now, when S coworkers are not paying their share, naturally the BURDEN on each coworker will increase in they have to raise their share in the total cost.
S are not paying their share, so # of coworkers who are willing to pay= T-S

Final BURDEN on each coworker----->Total cost/(T-S)

or X/(T-S)

Subtract the smaller from the larger.

X/(T-S) - X/T = XS/[T*(T-S)] .
Hope that helps.
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Re: To celebrate a colleague's retirement, the T coworkers [#permalink] New post 08 Dec 2012, 04:18
apoorvarora wrote:
To celebrate a colleague's retirement, the T coworkers in an office agreed to share equally the cost of a catered lunch. If the lunch costs a total of x dollars and S of the coworkers fail to pay their share, which of the following represents the additional amount, in dollars, that each of the remaining coworkers would have to contribute so that the cost of the lunch is completely paid?

A. x/T
B. x/T-S
C. Sx/T-S
D. Sx/T(T-S)
E. X(T-S)/T


I went with substitution method...
I replaced variables with values for easy calculations :-D

let
T =10
X= 200
s =2

Actual each person share 200/10 = 20

But 2 members didnt pay , so 8 members (T-S) would have paid the balance...
200/8 =25

25-20 = 5 Only choice D gives value same value..
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Re: To celebrate a colleague's retirement, the T coworkers [#permalink] New post 08 Dec 2012, 04:51
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apoorvarora wrote:
To celebrate a colleague's retirement, the T coworkers in an office agreed to share equally the cost of a catered lunch. If the lunch costs a total of x dollars and S of the coworkers fail to pay their share, which of the following represents the additional amount, in dollars, that each of the remaining coworkers would have to contribute so that the cost of the lunch is completely paid?

A. x/T
B. x/(T-S)
C. Sx/(T-S)
D. Sx/T(T-S)
E. X(T-S)/T


Pick some smart numbers.

Let T=3, x=$3 and S=2.

So, we'd have that originally 3 coworkers were to pay $1 each for $3 lunch but 2 coworkers fail to pay, thus the remaining worker should pay additional $2 to cover the cost of the lunch.

Now, substitute T=3, x=$3 and S=2 into the answers to see which yields $2. Only answer D works.

Answer: D.
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Re: To celebrate a colleague's retirement, the T coworkers [#permalink] New post 11 Jan 2015, 14:30
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Re: To celebrate a colleague's retirement, the T coworkers in an office [#permalink] New post 08 Feb 2015, 14:33
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Re: To celebrate a colleague's retirement, the T coworkers in an office   [#permalink] 08 Feb 2015, 14:33
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